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3w+12=5w-4+2\left(3w+4\right)
Use the distributive property to multiply 3 by w+4.
3w+12=5w-4+6w+8
Use the distributive property to multiply 2 by 3w+4.
3w+12=11w-4+8
Combine 5w and 6w to get 11w.
3w+12=11w+4
Add -4 and 8 to get 4.
3w+12-11w=4
Subtract 11w from both sides.
-8w+12=4
Combine 3w and -11w to get -8w.
-8w=4-12
Subtract 12 from both sides.
-8w=-8
Subtract 12 from 4 to get -8.
w=\frac{-8}{-8}
Divide both sides by -8.
w=1
Divide -8 by -8 to get 1.