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4(5d+10)+2=142
We move all terms to the left:
4(5d+10)+2-(142)=0
We add all the numbers together, and all the variables
4(5d+10)-140=0
We multiply parentheses
20d+40-140=0
We add all the numbers together, and all the variables
20d-100=0
We move all terms containing d to the left, all other terms to the right
20d=100
d=100/20
d=5
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