Answer:
EQUATION
1. 5×2-7+10=10
2. 7-2×2÷2=5
3. 6+6-2×2=20
4. 3+2-2×3=9
5. 5×5-5÷5=4
EXPRESSION
1. 3×-5
2. 3×(x-7)
3. x²+y²
4. (4x + 5y)
5. 5x + 7
