To solve for a:
w = 3(2a + b) - 4 Given
w = 6a + 3b - 4 Apply the distributive property
w - 6a = 3b - 4 Subtract 6a from both sides
-6a = 3b - 4 - w Subtract w from both sides
a = -3b - 4 - w / 6 Divide both sides by -6
Answer:
a = -3b - 4 - w / 6
Hope this helps!