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x/2+(3*x)/4-((5*x)/6) = 15 // - 15
x/2+(3*x)/4-((5*x)/6)-15 = 0
x/2+(3*x)/4+(-5/6)*x-15 = 0
5/12*x-15 = 0 // + 15
5/12*x = 15 // : 5/12
x = 15/5/12
x = 36
x = 36
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