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x in (-oo:+oo)
(9/5)*x = 6/7 // - 6/7
(9/5)*x-(6/7) = 0
(9/5)*x-6/7 = 0
9/5*x-6/7 = 0 // + 6/7
9/5*x = 6/7 // : 9/5
x = 6/7/9/5
x = 10/21
x = 10/21
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