20(15+d)=420

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Solution for 20(15+d)=420 equation: 



20(15+d)=420

We move all terms to the left:

20(15+d)-(420)=0

We add all the numbers together, and all the variables

20(d+15)-420=0

We multiply parentheses

20d+300-420=0

We add all the numbers together, and all the variables

20d-120=0

We move all terms containing d to the left, all other terms to the right

20d=120

d=120/20

d=6

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