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(2/5)*(x-6) = (1/4)*x+15 // - (1/4)*x+15
(2/5)*(x-6)-((1/4)*x)-15 = 0
(2/5)*(x-6)+(-1/4)*x-15 = 0
2/5*(x-6)-x/4-15 = 0
(2/5*4*(x-6))/4-x/4+(-15*4)/4 = 0
2/5*4*(x-6)-x-15*4 = 0
3/5*x-60-48/5 = 0
3/5*x-348/5 = 0
(3/5*x-348/5)/4 = 0
(3/5*x-348/5)/4 = 0 // * 4
3/5*x-348/5 = 0
3/5*x-348/5 = 0 // + 348/5
3/5*x = 348/5 // : 3/5
x = 348/5/3/5
x = 116
x = 116
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