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x in (-oo:+oo)
7/9-(7*x) = -49/18 // + -49/18
7/9-(7*x)-(-49/18) = 0
7/9-7*x+49/18 = 0
7/2-7*x = 0 // - 7/2
-7*x = -7/2 // : -7
x = -7/2/(-7)
x = 1/2
x = 1/2
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