15(20+d)=405

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Solution for 15(20+d)=405 equation: 



15(20+d)=405

We move all terms to the left:

15(20+d)-(405)=0

We add all the numbers together, and all the variables

15(d+20)-405=0

We multiply parentheses

15d+300-405=0

We add all the numbers together, and all the variables

15d-105=0

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

15d=105

d=105/15

d=7

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