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x in (-oo:+oo)
(x+81+88)/3 = 74 // - 74
(x+81+88)/3-74 = 0
(x+169)/3-74 = 0
(x+169)/3+(-74*3)/3 = 0
x-74*3+169 = 0
x-53 = 0
(x-53)/3 = 0
(x-53)/3 = 0 // * 3
x-53 = 0
x-53 = 0 // + 53
x = 53
x = 53
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