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x in (-oo:+oo)
(x+6+15)/2 = 36 // - 36
(x+6+15)/2-36 = 0
(x+21)/2-36 = 0
(x+21)/2+(-36*2)/2 = 0
x-36*2+21 = 0
x-51 = 0
(x-51)/2 = 0
(x-51)/2 = 0 // * 2
x-51 = 0
x-51 = 0 // + 51
x = 51
x = 51
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