Solve for b
b=-8
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-12-4b+2b=4
Add 2b to both sides.
-12-2b=4
Combine -4b and 2b to get -2b.
-2b=4+12
Add 12 to both sides.
-2b=16
Add 4 and 12 to get 16.
b=\frac{16}{-2}
Divide both sides by -2.
b=-8
Divide 16 by -2 to get -8.
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