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x in (-oo:+oo)
x-(7/9) = 3*x-43/9 // - 3*x-43/9
x-(3*x)-(7/9)-(-43/9) = 0
x-3*x-7/9+43/9 = 0
4-2*x = 0 // - 4
-2*x = -4 // : -2
x = -4/(-2)
x = 2
x = 2
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