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x in (-oo:+oo)
5*x+20/7 = -5 // + 5
5*x+20/7+5 = 0
5*x+55/7 = 0 // - 55/7
5*x = -55/7 // : 5
x = -55/7/5
x = -11/7
x = -11/7
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