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x in (-oo:+oo)
7*x-8 = 62-3*x // - 62-3*x
7*x-(-3*x)-62-8 = 0
7*x+3*x-62-8 = 0
10*x-70 = 0 // + 70
10*x = 70 // : 10
x = 70/10
x = 7
x = 7
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