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x in (-oo:+oo)
x/2+x/5 = 9/10 // - 9/10
x/2+x/5-(9/10) = 0
x/2+x/5-9/10 = 0
7/10*x-9/10 = 0 // + 9/10
7/10*x = 9/10 // : 7/10
x = 9/10/7/10
x = 9/7
x = 9/7
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