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x in (-oo:+oo)
(x+7)/4 = 13 // - 13
(x+7)/4-13 = 0
(x+7)/4+(-13*4)/4 = 0
x-13*4+7 = 0
x-45 = 0
(x-45)/4 = 0
(x-45)/4 = 0 // * 4
x-45 = 0
x-45 = 0 // + 45
x = 45
x = 45
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