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x in (-oo:+oo)
6*(x-10) = -90 // + 90
6*(x-10)+90 = 0
6*(x-10)+90 = 0
6*x+30 = 0
6*x+30 = 0
6*x+30 = 0 // - 30
6*x = -30 // : 6
x = -30/6
x = -5
x = -5
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