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x in (-oo:+oo)
x/7 = 6/5 // - 6/5
x/7-(6/5) = 0
x/7-6/5 = 0
1/7*x-6/5 = 0 // + 6/5
1/7*x = 6/5 // : 1/7
x = 6/5/1/7
x = 42/5
x = 42/5
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