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x in (-oo:+oo)
x-((5*x)/7) = 6 // - 6
x-((5*x)/7)-6 = 0
x+(-5/7)*x-6 = 0
2/7*x-6 = 0 // + 6
2/7*x = 6 // : 2/7
x = 6/2/7
x = 21
x = 21
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