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x in (-oo:+oo)
x-(3*x)-(6/4) = 2 // - 2
x-(3*x)-(6/4)-2 = 0
x-3*x-3/2-2 = 0
-2*x-7/2 = 0 // + 7/2
-2*x = 7/2 // : -2
x = 7/2/(-2)
x = -7/4
x = -7/4
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