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x in (-oo:+oo)
(7/5)*x-5 = 50 // - 50
(7/5)*x-50-5 = 0
7/5*x-55 = 0 // + 55
7/5*x = 55 // : 7/5
x = 55/7/5
x = 275/7
x = 275/7
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