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