Rewrite the equation as 3b+4c=a.
Subtract 4c from both sides of the equation.
Divide each term by 3 and simplify.
Divide each term in 3b=a-4c by 3.
Cancel the common factor of 3.
Cancel the common factor.
Divide b by 1.
Move the negative in front of the fraction.
Solve for b a=3b+4c