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x in (-oo:+oo)
5*x-20 = 70/14 // - 70/14
5*x-(70/14)-20 = 0
5*x-20-5 = 0
5*x-25 = 0 // + 25
5*x = 25 // : 5
x = 25/5
x = 5
x = 5
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