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x in (-oo:+oo)
20 = (3/4)*x // - (3/4)*x
20-((3/4)*x) = 0
(-3/4)*x+20 = 0
20-3/4*x = 0 // - 20
-3/4*x = -20 // : -3/4
x = -20/(-3/4)
x = 80/3
x = 80/3
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