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