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2(d+8)=20
We move all terms to the left:
2(d+8)-(20)=0
We multiply parentheses
2d+16-20=0
We add all the numbers together, and all the variables
2d-4=0
We move all terms containing d to the left, all other terms to the right
2d=4
d=4/2
d=2
| 2(d+8)=20 | | 2(d+8)=20 | | 2(d+8)=20 | | 7x-9=4x-69 | | 7x-9=4x-69 | | 7x-9=4x-69 | | 7x-9=4x-69 | | 65=z+31 | | 65=z+31 | | 65=z+31 | | 65=z+31 | | 9^x/2=243 | | 9^x/2=243 | | 65=z+31 | | 65=z+31 | | 65=z+31 | | 65=z+31 | | 65=z+31 | | 65=z+31 | | 65=z+31 | | 65=z+31 | | 65=z+31 | | 65=z+31 | | 65=z+31 | | 65=z+31 | | 65=z+31 | | 65=z+31 | | 18=r/6 | | 18=r/6 | | 18=r/6 | | 18=r/6 | | 18=r/6 |