15=7+-4d

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Solution for 15=7+-4d equation: 



15=7+-4d

We move all terms to the left:

15-(7+-4d)=0

We add all the numbers together, and all the variables

-(-4d)+15=0

We get rid of parentheses

4d+15=0

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

4d=-15

d=-15/4

d=-3+3/4

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