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