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x in (-oo:+oo)
7 = (-2/3)*x // - (-2/3)*x
7-((-2/3)*x) = 0
(2/3)*x+7 = 0
2/3*x+7 = 0 // - 7
2/3*x = -7 // : 2/3
x = -7/2/3
x = -21/2
x = -21/2
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