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x in (-oo:+oo)
8/7 = (3*x)/86 // - (3*x)/86
8/7-((3*x)/86) = 0
(-3/86)*x+8/7 = 0
8/7-3/86*x = 0 // - 8/7
-3/86*x = -8/7 // : -3/86
x = -8/7/(-3/86)
x = 688/21
x = 688/21
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