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12-((3/2)*x) = -30 // + 30
12-((3/2)*x)+30 = 0
(-3/2)*x+12+30 = 0
42-3/2*x = 0 // - 42
-3/2*x = -42 // : -3/2
x = -42/(-3/2)
x = 28
x = 28
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