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x in (-oo:+oo)
x-12 = (1/5)*x // - (1/5)*x
x-((1/5)*x)-12 = 0
x+(-1/5)*x-12 = 0
4/5*x-12 = 0 // + 12
4/5*x = 12 // : 4/5
x = 12/4/5
x = 15
x = 15
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