3(a+4)=75

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Solution for 3(a+4)=75 equation: 



3(a+4)=75

We move all terms to the left:

3(a+4)-(75)=0

We multiply parentheses

3a+12-75=0

We add all the numbers together, and all the variables

3a-63=0

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

3a=63

a=63/3

a=21

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