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x in (-oo:+oo)
3*5*x = 135/3 // - 135/3
3*5*x-(135/3) = 0
3*5*x-45 = 0
15*x-45 = 0 // + 45
15*x = 45 // : 15
x = 45/15
x = 3
x = 3
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