15d-40=7d+80

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Solution for 15d-40=7d+80 equation: 



15d-40=7d+80

We move all terms to the left:

15d-40-(7d+80)=0

We get rid of parentheses

15d-7d-80-40=0

We add all the numbers together, and all the variables

8d-120=0

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

8d=120

d=120/8

d=15

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