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x in (-oo:+oo)
81-((3/4)*x) = (3/2)*x // - (3/2)*x
81-((3/4)*x)-((3/2)*x) = 0
(-3/4)*x+(-3/2)*x+81 = 0
81-9/4*x = 0 // - 81
-9/4*x = -81 // : -9/4
x = -81/(-9/4)
x = 36
x = 36
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