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W=ac+7a+4c+28
Use the distributive property to multiply a+4 by c+7.
ac+7a+4c+28=W
Swap sides so that all variable terms are on the left hand side.
ac+7a+28=W-4c
Subtract 4c from both sides.
ac+7a=W-4c-28
Subtract 28 from both sides.
\left(c+7\right)a=W-4c-28
Combine all terms containing a.
\frac{\left(c+7\right)a}{c+7}=\frac{W-4c-28}{c+7}
Divide both sides by c+7.
a=\frac{W-4c-28}{c+7}
Dividing by c+7 undoes the multiplication by c+7.
W=ac+7a+4c+28
Use the distributive property to multiply a+4 by c+7.