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