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x in (-oo:+oo)
(x+3)/7 = 25 // - 25
(x+3)/7-25 = 0
(x+3)/7+(-25*7)/7 = 0
x-25*7+3 = 0
x-172 = 0
(x-172)/7 = 0
(x-172)/7 = 0 // * 7
x-172 = 0
x-172 = 0 // + 172
x = 172
x = 172
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