уравнение:-2x-21=7x+42

1. The plants ..., if you don't water them.

a) will grow, b) grow, c) won't grow

2. I would buy that bag if it ... cheaper.

a) is, b) were, c) will be, d) would be

3. If Tom ... on coast, he will catch a cold.

a) puts, b) doesn't put, c) won't put

Помогите пожалуйста!!!