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x in (-oo:+oo)
x/4+x/5 = 27/10 // - 27/10
x/4+x/5-(27/10) = 0
x/4+x/5-27/10 = 0
9/20*x-27/10 = 0 // + 27/10
9/20*x = 27/10 // : 9/20
x = 27/10/9/20
x = 6
x = 6
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