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x in (-oo:+oo)
(1/5)*x = 9/7 // - 9/7
(1/5)*x-(9/7) = 0
(1/5)*x-9/7 = 0
1/5*x-9/7 = 0 // + 9/7
1/5*x = 9/7 // : 1/5
x = 9/7/1/5
x = 45/7
x = 45/7
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