6a-15+3a=28+38

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Solution for 6a-15+3a=28+38 equation: 



6a-15+3a=28+38

We move all terms to the left:

6a-15+3a-(28+38)=0

We add all the numbers together, and all the variables

6a+3a-15-66=0

We add all the numbers together, and all the variables

9a-81=0

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

9a=81

a=81/9

a=9

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