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x in (-oo:+oo)
12/15 = (32/4)*x // - (32/4)*x
12/15-((32/4)*x) = 0
12/15-8*x = 0
4/5-8*x = 0 // - 4/5
-8*x = -4/5 // : -8
x = -4/5/(-8)
x = 1/10
x = 1/10
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