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18-(3*x) = (5*x)/4+2 // - (5*x)/4+2
18-(3*x)-((5*x)/4)-2 = 0
(-5/4)*x-3*x-2+18 = 0
16-17/4*x = 0 // - 16
-17/4*x = -16 // : -17/4
x = -16/(-17/4)
x = 64/17
x = 64/17
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