1) 4(-2z +5) = 14 -2(4z -3)
-8z +20 = 14 -8z +6
20 = 20
2) -5(z-7) = 30 -(2z +1)
-5z +35 = 30 -2z -1
-5z +2z = 30 -1 -35
-3z = -6
z = 2
3) -2(x+5)+3 = 2 -3(x +1)
-2x -10 +3 = 2 -3x -3
-2x +3x = 2 -3 +10 -3
x = 6
4) 3(2x -1) + 6x = 10x -7
6x -3 +6x = 10x -7
6x -10x = -7 +3
-4x = -4
x = 1
5) 0,3(x-4) -0,7x = -2
0,3x -1,2 -0,7x = -2
0,3x -0,7x = -2 +1,2
-0,4x = -0,8
x = 2
6) 0,6(5+2x) -2 = 0,2x
3 +1,2x -2 = 0,2x
1,2x -0,2x = -3 +2
x = -1
7) -2,5(x-4) +0,5x = 24
-2,5x +10 +0,5x = 24
2x = 24 -10
2x = 14
x = 7
8) 48 -0,2(x+16) +1,2x = 3,8
48 -0,2x -3,2 +1,2x = 3,8
-0,2x +1,2x = 3,8 -48 +3,2
x = -48 +7
x = -41