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1/2(x + 3) * 8 = x - 3 ?
1/2x + 1/2 * 3 * 8 = x - 3
1/2x + 1/2 * 24 = x - 3
1/2x - x + 12 = - 3
-1/2x = -3 - 12
-1/2x = -15 I *(-2)
x = 30