Answer: #20, x = 3
#21, x = 1/2
Step-by-step explanation:
#20) x + 4 + x + 2+ x + 5 = x + 3 +x+3+x+1+x+1
3x + 11 = 4x + 8
-3x -3x
11= x + 8
- 8 - 8
3 = x
#21) 12x(5) = 6x + 9 + x + 10 + x + 7
60x =8x + 26
-8x -8x
52x = 26
divide both sides by 52
x = 1/2
