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x in (-oo:+oo)
(4*(x-3))/15 = 20 // - 20
(4*(x-3))/15-20 = 0
(4*(x-3))/15+(-20*15)/15 = 0
4*(x-3)-20*15 = 0
4*x-312 = 0
(4*x-312)/15 = 0
(4*x-312)/15 = 0 // * 15
4*x-312 = 0
4*x-312 = 0 // + 312
4*x = 312 // : 4
x = 312/4
x = 78
x = 78
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