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10x + 20 = 8x - 12
10x - 8x = -12 - 20
2x = -32
x = -16
10x + 20 = 8x - 12
10x - 8x = -12 - 20
2x = -32
x = -16
2x + 8 = 2(-16) + 8
= -32 + 8
= -24