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x in (-oo:+oo)
(2/3)*x+4 = (-1/3)*x-3 // - (-1/3)*x-3
(2/3)*x-((-1/3)*x)+3+4 = 0
(2/3)*x+(1/3)*x+3+4 = 0
x+7 = 0 // - 7
x = -7
x = -7
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