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x in (-oo:+oo)
(13/14)*x+9/7 = (6/7)*x // - (6/7)*x
(13/14)*x-((6/7)*x)+9/7 = 0
(13/14)*x+(-6/7)*x+9/7 = 0
1/14*x+9/7 = 0 // - 9/7
1/14*x = -9/7 // : 1/14
x = -9/7/1/14
x = -18
x = -18
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