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x in (-oo:+oo)
(x-7)/4 = 12 // - 12
(x-7)/4-12 = 0
(x-7)/4+(-12*4)/4 = 0
x-12*4-7 = 0
x-55 = 0
(x-55)/4 = 0
(x-55)/4 = 0 // * 4
x-55 = 0
x-55 = 0 // + 55
x = 55
x = 55
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