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8a-12a = -24 + 12
-4a = -12
a = -12/-4
a = 3
2. 15x-30 = 8x + 34
15x - 8x = 34 + 30
7x = 64
x = 64/7
x = 9 1/7
3. 8x+ 32 = 6x- 18
8x - 6x = -18 - 32
2x = -50
x = -50/2
x = -25
4. 18a - 24 = 20a - 32
18a - 20a = -32 + 24
-2a = -8
a = -8/-2
a = 4
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