15=7-2d

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Solution for 15=7-2d equation: 



15=7-2d

We move all terms to the left:

15-(7-2d)=0

We add all the numbers together, and all the variables

-(-2d+7)+15=0

We get rid of parentheses

2d-7+15=0

We add all the numbers together, and all the variables

2d+8=0

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

2d=-8

d=-8/2

d=-4

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