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15-((3/4)*x) = 3 // - 3
15-((3/4)*x)-3 = 0
(-3/4)*x-3+15 = 0
12-3/4*x = 0 // - 12
-3/4*x = -12 // : -3/4
x = -12/(-3/4)
x = 16
x = 16
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