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x in (-oo:+oo)
20 = (-2/3)*x // - (-2/3)*x
20-((-2/3)*x) = 0
(2/3)*x+20 = 0
2/3*x+20 = 0 // - 20
2/3*x = -20 // : 2/3
x = -20/2/3
x = -30
x = -30
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