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x in (-oo:+oo)
5*(x-9) = -90 // + 90
5*(x-9)+90 = 0
5*(x-9)+90 = 0
5*x+45 = 0
5*x+45 = 0
5*x+45 = 0 // - 45
5*x = -45 // : 5
x = -45/5
x = -9
x = -9
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