Answer:
21x -14 +77y
Step-by-step explanation:
7(6x - (2 - 7y + 3x) + 4y)
Work from the inside out
Distribute the minus sign
7(6x - 2 + 7y - 3x + 4y)
Combine like terms
7(3x - 2 + 11y )
Distribute
