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