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x in (-oo:+oo)
(-3/7)*x-(7/9) = 0
(-3/7)*x-7/9 = 0
-3/7*x-7/9 = 0 // + 7/9
-3/7*x = 7/9 // : -3/7
x = 7/9/(-3/7)
x = -49/27
x = -49/27
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