1) (4567 + 67885) - (456 + 565) + (457549) = (4567 + 33940) - (1021) + (411786) = 38507 - 1021 + 411786 = 436272

2) 6 + x2 + y + 1 + 6y = 80
Rearranging the equation:
2x + 7y = 73

There are multiple possible solutions for x and y that satisfy this equation.