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x in (-oo:+oo)
(5/6)*x-((3/7)*x)+5/9 = 0
(5/6)*x+(-3/7)*x+5/9 = 0
17/42*x+5/9 = 0 // - 5/9
17/42*x = -5/9 // : 17/42
x = -5/9/17/42
x = -70/51
x = -70/51
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