Solve for c
c=6
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42=6+8c-12
Use the distributive property to multiply -4 by -2c+3.
42=-6+8c
Subtract 12 from 6 to get -6.
-6+8c=42
Swap sides so that all variable terms are on the left hand side.
8c=42+6
Add 6 to both sides.
8c=48
Add 42 and 6 to get 48.
c=\frac{48}{8}
Divide both sides by 8.
c=6
Divide 48 by 8 to get 6.
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