10(8x + 2y) + y − 3(y − 5x)
= 10 × (8x + 2y) + y − 3 × (y − 5x)
= 80x + 20y + y - 3y + 15x
= 80x + 21y - 3y + 15x
= 80x + 18y + 15x
= 95x + 18y
