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x in (-oo:+oo)
3-(x/7) = (5*x)/7-9 // - (5*x)/7-9
3-(x/7)-((5*x)/7)+9 = 0
(-5/7)*x-(x/7)+3+9 = 0
12-6/7*x = 0 // - 12
-6/7*x = -12 // : -6/7
x = -12/(-6/7)
x = 14
x = 14
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