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x in (-oo:+oo)
-2*x-((1/4)*x)-6-3 = 90 // - 90
-2*x-((1/4)*x)-90-6-3 = 0
(-1/4)*x-2*x-90-6-3 = 0
-9/4*x-99 = 0 // + 99
-9/4*x = 99 // : -9/4
x = 99/(-9/4)
x = -44
x = -44
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