Question

21) –2 ( y + 4 ) = -7+ 9 ( y – 1)
22) 5 ( x – 4) = -4 + 9 ( x – 1)
23) –5 ( x – 4 ) + 4 = 2 ( - 2 x – 2 ) + 9
24) -2 ( m – 5 ) + 3m = - ( m + 2 ) – 7
25) - ( x + 5) – 6 = -9 ( x – 3 ) – 2
26) x - 7 + 2 ( x – 4 ) = -3 ( x + 2 ) – 8

Answer 1

21) -2.(y+4)=-7+9.(y-1)
-2y-8=-7+9y-9
-2y-9y=-7-9+8
-11y=-16+8
-11y=-8.(-1)
11y=8
y=8/11
22) 5.(x-4)=-4+9.(x-1)
5x-20=-4+9x-9
5x-9x=-4-9+20
-4x=-13+20
-4x=7.(-1)
4x=-7
x=-7/4
23) -5.(x-4)+4=2.(-2x-2)+9
-5x+20+4=-4x-4+9
-5x+4x=-4+9-4-20
-x=-28+9
-x=-19.(-1)
x=19
24) -2.(m-5)+3m=-(m+2)-7
-2m+10+3m=-m-2-7
-2m+3m+m=-2-7-10
-2m+4m=-19
2m=-19
m=-19/2
25) -(x+5)-6=-9.(x-3)-2
-x-5-6=-9x+27-2
-x+9x=27-2+6+5
8x=27-2+11
8x=27+9
8x=36
x=36/8
x=4,5
26) x-7+2.(x-4)=-3.(x+2)-8
x-7+2x-8=-3x-6-8
x+2x+3x=-6-8+8+7
6x=-14+15
6x=1
x=1/6