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x in (-oo:+oo)
x/5 = 7/15 // - 7/15
x/5-(7/15) = 0
x/5-7/15 = 0
1/5*x-7/15 = 0 // + 7/15
1/5*x = 7/15 // : 1/5
x = 7/15/1/5
x = 7/3
x = 7/3
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