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x in (-oo:+oo)
3*x = 15/100 // - 15/100
3*x-(15/100) = 0
3*x-3/20 = 0
3*x-3/20 = 0 // + 3/20
3*x = 3/20 // : 3
x = 3/20/3
x = 1/20
x = 1/20
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