2.5b+5b=-2

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Solution for 2.5b+5b=-2 equation: 



2.5b+5b=-2

We move all terms to the left:

2.5b+5b-(-2)=0

We add all the numbers together, and all the variables

7.5b+2=0

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

7.5b=-2

b=-2/7.5

b=-2/7.5

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