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0.6(d+3)=4.2
We move all terms to the left:
0.6(d+3)-(4.2)=0
We add all the numbers together, and all the variables
0.6(d+3)-4.2=0
We multiply parentheses
0.6d+1.8-4.2=0
We add all the numbers together, and all the variables
0.6d-2.4=0
We move all terms containing d to the left, all other terms to the right
0.6d=2.4
d=2.4/0.6
d=4
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