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5(d-7)+21=-29
We move all terms to the left:
5(d-7)+21-(-29)=0
We add all the numbers together, and all the variables
5(d-7)+50=0
We multiply parentheses
5d-35+50=0
We add all the numbers together, and all the variables
5d+15=0
We move all terms containing d to the left, all other terms to the right
5d=-15
d=-15/5
d=-3
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