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