Question

2a - 15 = -2a + -3
7 - 6a = 6 - 7a
9/2x +5 = 3/2x +17
2(r - 4) = 5(r+ -7)
5a + 6 = -4a + -7
3a - 42 = -3(a+4)
7x -4 = 6x +11
19 - 4a = 3 - 6a

Answer 1

1)2a+2a=-3+15
4a=12
a=12/4=3

2)7-6a=6-7a
-6a+7a=6-7
a=-1

3)9/2x +5 = 3/2x +17
4.5x-1.5x=17-5
3x=12
x=4

4)2(r - 4) = 5(r+ -7)
2r-8=5r-35
-8+35=5r-2r
27=3r
27/3=9=r

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