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x in (-oo:+oo)
(5*x)/7-((2*x)/3) = 1 // - 1
(5*x)/7-((2*x)/3)-1 = 0
(5*x)/7+(-2/3)*x-1 = 0
1/21*x-1 = 0 // + 1
1/21*x = 1 // : 1/21
x = 1/1/21
x = 21
x = 21
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