Solve for the indicated variable

Question

4a + b = c
for a.

Answer 1

4a + b = c

 

Subtract b from both sides.

 

4a + b - b = c - b

 

4a = c - b

 

Divide both sides by 4.

 

4a/4 = (c - b)/4

 

a = (c - b)/4