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x in (-oo:+oo)
(1/4)*x-(2*x)-6-3+90 = 180 // - 180
(1/4)*x-(2*x)-180-6-3+90 = 0
(1/4)*x-2*x-180-6-3+90 = 0
-7/4*x-99 = 0 // + 99
-7/4*x = 99 // : -7/4
x = 99/(-7/4)
x = -396/7
x = -396/7
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