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x in (-oo:+oo)
(x-3)/5 = 7 // - 7
(x-3)/5-7 = 0
(x-3)/5+(-7*5)/5 = 0
x-7*5-3 = 0
x-38 = 0
(x-38)/5 = 0
(x-38)/5 = 0 // * 5
x-38 = 0
x-38 = 0 // + 38
x = 38
x = 38
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