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x in (-oo:+oo)
x-(3*(x+3/4)) = 2*x+3 // - 2*x+3
x-(3*(x+3/4))-(2*x)-3 = 0
x-3*(x+3/4)-2*x-3 = 0
x-3*(x+3/4)-2*x-3 = 0
-2*x-2*x-3-9/4 = 0
-4*x-3-9/4 = 0
-4*x-21/4 = 0
-4*x-21/4 = 0
-4*x-21/4 = 0 // + 21/4
-4*x = 21/4 // : -4
x = 21/4/(-4)
x = -21/16
x = -21/16
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