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x in (-oo:+oo)
75 = (3/5)*x // - (3/5)*x
75-((3/5)*x) = 0
(-3/5)*x+75 = 0
75-3/5*x = 0 // - 75
-3/5*x = -75 // : -3/5
x = -75/(-3/5)
x = 125
x = 125
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