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x in (-oo:+oo)
100*(x/2) = 3*x+12 // - 3*x+12
100*(x/2)-(3*x)-12 = 0
100*(x/2)-3*x-12 = 0
47*x-12 = 0 // + 12
47*x = 12 // : 47
x = 12/47
x = 12/47
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