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x in (-oo:+oo)
150 = (3/5)*x // - (3/5)*x
150-((3/5)*x) = 0
(-3/5)*x+150 = 0
150-3/5*x = 0 // - 150
-3/5*x = -150 // : -3/5
x = -150/(-3/5)
x = 250
x = 250
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