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18-((3/4)*x) = 12 // - 12
18-((3/4)*x)-12 = 0
(-3/4)*x-12+18 = 0
6-3/4*x = 0 // - 6
-3/4*x = -6 // : -3/4
x = -6/(-3/4)
x = 8
x = 8
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