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x in (-oo:+oo)
2*x-10 = 71-7*x // - 71-7*x
2*x-(-7*x)-71-10 = 0
2*x+7*x-71-10 = 0
9*x-81 = 0 // + 81
9*x = 81 // : 9
x = 81/9
x = 9
x = 9
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