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x in (-oo:+oo)
12 = (3/5)*x // - (3/5)*x
12-((3/5)*x) = 0
(-3/5)*x+12 = 0
12-3/5*x = 0 // - 12
-3/5*x = -12 // : -3/5
x = -12/(-3/5)
x = 20
x = 20
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