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x in (-oo:+oo)
x/9 = x/4+7/9 // - x/4+7/9
x/9-(x/4)-(7/9) = 0
x/9-(x/4)-7/9 = 0
-5/36*x-7/9 = 0 // + 7/9
-5/36*x = 7/9 // : -5/36
x = 7/9/(-5/36)
x = -28/5
x = -28/5
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