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x in (-oo:+oo)
3*5*x-(1/2) = 99.5 // - 99.5
3*5*x-(1/2)-99.5 = 0
3*5*x-1/2-99.5 = 0
15*x-100 = 0 // + 100
15*x = 100 // : 15
x = 100/15
x = 20/3
x = 20/3
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