3(2+1f)=-15

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Solution for 3(2+1f)=-15 equation: 



3(2+1f)=-15

We move all terms to the left:

3(2+1f)-(-15)=0

We add all the numbers together, and all the variables

3(f+2)-(-15)=0

We add all the numbers together, and all the variables

3(f+2)+15=0

We multiply parentheses

3f+6+15=0

We add all the numbers together, and all the variables

3f+21=0

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

3f=-21

f=-21/3

f=-7

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