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x in (-oo:+oo)
(5/6)*x-((3/11)*x)+4/7 = 0
(5/6)*x+(-3/11)*x+4/7 = 0
37/66*x+4/7 = 0 // - 4/7
37/66*x = -4/7 // : 37/66
x = -4/7/37/66
x = -264/259
x = -264/259
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