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x in (-oo:+oo)
90 = (1/4)*x // - (1/4)*x
90-((1/4)*x) = 0
(-1/4)*x+90 = 0
90-1/4*x = 0 // - 90
-1/4*x = -90 // : -1/4
x = -90/(-1/4)
x = 360
x = 360
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