А) 2(4–9d)–(2d+3)=–8(4–d)+3(1+2d) б) 5(2–3b)–4(6+2b)=28–(b–2) в)...

Question

А) 2(4–9d)–(2d+3)=–8(4–d)+3(1+2d) б) 5(2–3b)–4(6+2b)=28–(b–2) в) –2(3x+4)+(6x+8)=4(5x–2–(5x+8) г) 8(4–3y)–(7–2y)=–(6+3y)+8(y–2)

Answer 1

A) 2(4-9d)-(2d+3)=-8(4-d)+3(1+2d)
8-18d-2d-3=-32+8d+3+6d
5-20d=-29+14d
14d+20d=29+5
34d=34
d=34:34
d=1
b) 5(2-3b)-4(6+2b)=28-(b-2)
10-15b-24-8b=28-b+2
-14-23b=30-b
23b-b=-30-14
22b=-44
b=-44:22
b=-2
c)-2(3x+4)+(6x+8)=4(5x-2)-(5x+8)
-6x-8+6x+8=20x-8-5x-8
0=15x-16
15x=16
x=16:15

d) 8(4-3y)-(7-2y)=-(6+3y)+8(y-2)
32-24y-7+2y=-6-3y+8y-16
25-22y=5y-22
22y+5y=25+22
27y=47
y=47:27