5a+12a-7a=100

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Solution for 5a+12a-7a=100 equation: 



5a+12a-7a=100

We move all terms to the left:

5a+12a-7a-(100)=0

We add all the numbers together, and all the variables

10a-100=0

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

10a=100

a=100/10

a=10

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