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x in (-oo:+oo)
90 = (8/5)*x // - (8/5)*x
90-((8/5)*x) = 0
(-8/5)*x+90 = 0
90-8/5*x = 0 // - 90
-8/5*x = -90 // : -8/5
x = -90/(-8/5)
x = 225/4
x = 225/4
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