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x in (-oo:+oo)
-60 = (-2/3)*x // - (-2/3)*x
-((-2/3)*x)-60 = 0
(2/3)*x-60 = 0
2/3*x-60 = 0 // + 60
2/3*x = 60 // : 2/3
x = 60/2/3
x = 90
x = 90
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