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x in (-oo:+oo)
x+x+9/5-(2/4) = 7/4 // - 7/4
x+x+9/5-(2/4)-(7/4) = 0
x+x+9/5-1/2-7/4 = 0
2*x-9/20 = 0 // + 9/20
2*x = 9/20 // : 2
x = 9/20/2
x = 9/40
x = 9/40
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