Simplify 2a+2-3a-5+a-4+7a

$2 a + 2 - 3 a - 5 + a - 4 + 7 a$

Subtract $3 a$ from $2 a$ .

$- a + 2 - 5 + a - 4 + 7 a$

Combine the opposite terms in $- a + 2 - 5 + a - 4 + 7 a$ .

Add $- a$ and $a$ .

$0 + 2 - 5 - 4 + 7 a$

Add $0$ and $2$ .

$2 - 5 - 4 + 7 a$

Simplify by subtracting numbers.

Subtract $5$ from $2$ .

$- 3 - 4 + 7 a$

Subtract $4$ from $- 3$ .

$- 7 + 7 a$