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x in (-oo:+oo)
-3767/63 = (4/7)*x+7*x+7/9 // - (4/7)*x+7*x+7/9
-((4/7)*x)-(7*x)-3767/63-(7/9) = 0
(-4/7)*x-7*x-3767/63-7/9 = 0
-53/7*x-424/7 = 0 // + 424/7
-53/7*x = 424/7 // : -53/7
x = 424/7/(-53/7)
x = -8
x = -8
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