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x in (-oo:+oo)
1/2-(3*x)-(4*x)-(3/2) = 0
1/2-3*x-4*x-3/2 = 0
-7*x-1 = 0 // + 1
-7*x = 1 // : -7
x = 1/(-7)
x = -1/7
x = -1/7
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