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)

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 [latex]x=1 \frac{1}{15} [/latex] 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 [latex]y=1 \frac{20}{27} [/latex]