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x in (-oo:+oo)
5*x-x+1/2-(3/3) = 4 // - 4
5*x-x+1/2-(3/3)-4 = 0
5*x-x+1/2-4-1 = 0
4*x-9/2 = 0 // + 9/2
4*x = 9/2 // : 4
x = 9/2/4
x = 9/8
x = 9/8
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