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x in (-oo:+oo)
x/5 = 7/9 // - 7/9
x/5-(7/9) = 0
x/5-7/9 = 0
1/5*x-7/9 = 0 // + 7/9
1/5*x = 7/9 // : 1/5
x = 7/9/1/5
x = 35/9
x = 35/9
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