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x in (-oo:+oo)
(1/3)*x+2 = 2*x+7 // - 2*x+7
(1/3)*x-(2*x)-7+2 = 0
(1/3)*x-2*x-7+2 = 0
-5/3*x-5 = 0 // + 5
-5/3*x = 5 // : -5/3
x = 5/(-5/3)
x = -3
x = -3
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