To solve this expression, first substitute x+y = 3 into the expression:
6(3x+5y) + 7x - 5y
= 6(3(3-y) + 5y) + 7(3-y) - 5y= 6(9-3y+5y) + 21 - 7y - 5y= 6(9+2y) + 21 - 12y= 54 + 12y + 21 - 12y= 75
Therefore, the simplified expression is 75.
To solve this expression, first substitute x+y = 3 into the expression:
6(3x+5y) + 7x - 5y
= 6(3(3-y) + 5y) + 7(3-y) - 5y
= 6(9-3y+5y) + 21 - 7y - 5y
= 6(9+2y) + 21 - 12y
= 54 + 12y + 21 - 12y
= 75
Therefore, the simplified expression is 75.