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x in (-oo:+oo)
90 = (2/3)*x // - (2/3)*x
90-((2/3)*x) = 0
(-2/3)*x+90 = 0
90-2/3*x = 0 // - 90
-2/3*x = -90 // : -2/3
x = -90/(-2/3)
x = 135
x = 135
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