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x in (-oo:+oo)
x+3/4 = 2*x+6/3 // - 2*x+6/3
x-(2*x)+3/4-(6/3) = 0
x-2*x+3/4-2 = 0
-x-5/4 = 0 // + 5/4
-x = 5/4 // * -1
x = -5/4
x = -5/4
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