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