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x in (-oo:+oo)
(-1/5)*x+15 = 3-x // - 3-x
(-1/5)*x+x-3+15 = 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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