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x in (-oo:+oo)
-36 = (9*x)/4 // - (9*x)/4
-((9*x)/4)-36 = 0
(-9/4)*x-36 = 0
-9/4*x-36 = 0 // + 36
-9/4*x = 36 // : -9/4
x = 36/(-9/4)
x = -16
x = -16
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