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x in (-oo:+oo)
(x+87+90)/3 = 79 // - 79
(x+87+90)/3-79 = 0
(x+177)/3-79 = 0
(x+177)/3+(-79*3)/3 = 0
x-79*3+177 = 0
x-60 = 0
(x-60)/3 = 0
(x-60)/3 = 0 // * 3
x-60 = 0
x-60 = 0 // + 60
x = 60
x = 60
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