2d+15=-d-15

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Solution for 2d+15=-d-15 equation: 



2d+15=-d-15

We move all terms to the left:

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

We add all the numbers together, and all the variables

2d-(-1d-15)+15=0

We get rid of parentheses

2d+1d+15+15=0

We add all the numbers together, and all the variables

3d+30=0

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

3d=-30

d=-30/3

d=-10

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