Ответ:
1) 5
2) -2
3) -6
4) 0
5) 4
6) 3
7) -3,5
8) 3,6
9) 2,3
10) 0
11) 13,5
12) 0
13) -64
14) 0
15)
16)
17) -9
18) -5
19) -17
20) 2
Пошаговое объяснение:
1) 4(х - 6) = х - 9
4x - 24 = x - 9
3x = 15
x = 5
2) 6 – 3(х + 1) = 7 – х
6 - 3x - 3 = 7 - x
-3x + x = 7 - 6 + 3
-2x = 4
x = -2
3) (8х + 3) – (10х + 6) = 9
8x + 3 - 10x - 6 = 9
8x - 10x = 9 - 3 + 6
-2x = 12
x = -6
4) 14х – 14 = 7(2х - 3) +7
14x - 14 = 14x - 21 + 7
14x - 14x = -21 + 7 + 14
0x = 0
x = 0
5) 3(х - 2) = х + 2
3x - 6 = x + 2
2x = 8
x = 4
6) 5 – 2(х - 1) = 4 – х
5 - 2x + 2 = 4 - x
-2x + x = 4 - 5 - 2
-x = -3
x = 3
7) (7х +1) – (9х + 3) = 5
7x + 1 - 9x - 3 = 5
-2x = 7
x = -3,5
8) 3,4 + 2у = 7(у – 2,3)
3,4 + 2y = 7y - 14,6
5y = 18
y = 3,6
9) 4(5х + 2) = 10(3х - 3) + 15
20x + 8 = 30x - 30 + 15
-10x = -23
x = 2,3
10) 2(7х - 7) = 7(2х - 3) + 7
14x - 14 = 14x - 21 + 7
0x = 0
x = 0
11) 5,6 – 3(2 – 0,4х) = 0,4(4х - 1)
5,6 - 6 + 1,2x = 1,6x - 0,4
0,4x = 5,4
x = 13,5
12) 5(х - 12) = 6(х - 10) – х
5x - 60 = 6x - 60 - x
0x = 0
x = 0
13) 0,3(8 – 3у) = 3,2 – 0,8(у - 7)
2,4 - 0,9y = 3,2 - 0,8y + 5,6
0,1y = -6,4
y = -64
14) 4(х - 1) = 2(2х - 8) + 12
4x - 4 = 4x - 16 + 12
0x = 0
x = 0
15) 8(5 – 3х) = 6(2 – 4х) + 7
40 - 24x = 12 - 24x + 7
0x = -21
Вероятно неверно записан пример.
16) 7(4х - 1) = 6 – 2(3 – 14х)
28x - 7 = 6 - 6 + 28x
0x = 7
Вероятно неверно записан пример.
17) 4 - 6(х + 2) = 3 – 5х
4 - 6x - 12 = 3 - 5x
x = -9
18) (5х + 8) – (8х + 14) = 9
5x + 8 - 8x - 14 = 9
-3x = 15
x = -5
19) -7(х + 3) + 9 = 5 – 6х
-7x - 21 + 9 = 5 - 6x
-x = 17
x = -17
20) – (11х - 7) + (7х + 9) = 8
-11x + 7 + 7x + 9 = 8
-4x = -8
x = 2