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x in (-oo:+oo)
(7/3)*x+(1/3)*x = 3*x+(5/3)*x+12/3 // - 3*x+(5/3)*x+12/3
(7/3)*x+(1/3)*x-(3*x)-((5/3)*x)-(12/3) = 0
(7/3)*x+(1/3)*x-3*x+(-5/3)*x-4 = 0
-2*x-4 = 0 // + 4
-2*x = 4 // : -2
x = 4/(-2)
x = -2
x = -2
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