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x in (-oo:+oo)
x+x-(1/5)-(9/2) = 4 // - 4
x+x-(1/5)-(9/2)-4 = 0
x+x-1/5-9/2-4 = 0
2*x-87/10 = 0 // + 87/10
2*x = 87/10 // : 2
x = 87/10/2
x = 87/20
x = 87/20
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