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x in (-oo:+oo)
x/5 = 4/7 // - 4/7
x/5-(4/7) = 0
x/5-4/7 = 0
1/5*x-4/7 = 0 // + 4/7
1/5*x = 4/7 // : 1/5
x = 4/7/1/5
x = 20/7
x = 20/7
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