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90-(2*x)-((1/4)*x)-6-3 = 180 // - 180
90-(2*x)-((1/4)*x)-180-6-3 = 0
(-1/4)*x-2*x-180-6-3+90 = 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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