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-12x-6+6\left(2x+1\right)
Use the distributive property to multiply -3 by 4x+2.
-12x-6+12x+6
Use the distributive property to multiply 6 by 2x+1.
-6+6
Combine -12x and 12x to get 0.
0
Add -6 and 6 to get 0.
6\left(-\left(2x+1\right)+2x+1\right)
Factor out 6.
0
Simplify.
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