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x in (-oo:+oo)
(x-7)/3 = 10 // - 10
(x-7)/3-10 = 0
(x-7)/3+(-10*3)/3 = 0
x-10*3-7 = 0
x-37 = 0
(x-37)/3 = 0
(x-37)/3 = 0 // * 3
x-37 = 0
x-37 = 0 // + 37
x = 37
x = 37
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