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x in (-oo:+oo)
x/2+4/5 = 17/10 // - 17/10
x/2+4/5-(17/10) = 0
x/2+4/5-17/10 = 0
1/2*x-9/10 = 0 // + 9/10
1/2*x = 9/10 // : 1/2
x = 9/10/1/2
x = 9/5
x = 9/5
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