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