d-(-d)+3d=7

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Solution for d-(-d)+3d=7 equation: 



d-(-d)+3d=7

We move all terms to the left:

d-(-d)+3d-(7)=0

We add all the numbers together, and all the variables

d-(-1d)+3d-7=0

We add all the numbers together, and all the variables

4d-(-1d)-7=0

We get rid of parentheses

4d+1d-7=0

We add all the numbers together, and all the variables

5d-7=0

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

5d=7

d=7/5

d=1+2/5

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