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)

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А) 2(4–9d)–(2d+3)=–8(4–d)+3(1+2d)
8 - 18d - 2d - 3 = -32 + 8d + 3 + 6d
5 - 20d = -32 + 14d
5 + 32 = 20d + 14d
37 = 34d
d = 37/34

б) 5(2–3b)–4(6+2b)=28–(b–2)
10 - 15b - 24 - 8b = 28 - b + 2
-14 - 23b = 26 - b
-14 - 26 = b - 23b
b = 12/22
b = 6/11

в) –2(3x+4)+(6x+8)=4(5x–2–(5x+8))
-6x - 8 + 6x + 8 = 20x - 8 - 20 - 5x - 8
0 = -5x - 36
5x = -36
x = -36/5

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