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x in (-oo:+oo)
x/7 = 9/5 // - 9/5
x/7-(9/5) = 0
x/7-9/5 = 0
1/7*x-9/5 = 0 // + 9/5
1/7*x = 9/5 // : 1/7
x = 9/5/1/7
x = 63/5
x = 63/5
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