5a+7a=132

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Solution for 5a+7a=132 equation: 



5a+7a=132

We move all terms to the left:

5a+7a-(132)=0

We add all the numbers together, and all the variables

12a-132=0

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

12a=132

a=132/12

a=11

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