1. A - x=11 B - x=-11 C - x=21 D - x=18
2. A - 2 B - 3 C - D - -2
3. A - 8b+36=8b+36 identity or all numbers. B - -8b-36=-8b-36 identity or all numbers. C - -8b+36=-8b+36 identity or all numbers. D - 8b-36=8b-36 identity or all numbers.
4. A - a=-0.5 B - a=-0.25 C - a=0.25 D - a=-0.2
