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x in (-oo:+oo)
(x+6+12+15)/4 = 10 // - 10
(x+6+12+15)/4-10 = 0
(x+33)/4-10 = 0
(x+33)/4+(-10*4)/4 = 0
x-10*4+33 = 0
x-7 = 0
(x-7)/4 = 0
(x-7)/4 = 0 // * 4
x-7 = 0
x-7 = 0 // + 7
x = 7
x = 7
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