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(15*(36*x-(12*x)))/120 = 3 // - 3
(15*(36*x-(12*x)))/120-3 = 0
(15*(36*x-12*x))/120-3 = 0
(15*24*x)/120-3 = 0
(15*24*x)/120+(-3*120)/120 = 0
15*24*x-3*120 = 0
360*x-360 = 0
(360*x-360)/120 = 0
(360*x-360)/120 = 0 // * 120
360*x-360 = 0
360*x-360 = 0 // + 360
360*x = 360 // : 360
x = 360/360
x = 1
x = 1
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