12a+7-4a=18+21

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Solution for 12a+7-4a=18+21 equation: 



12a+7-4a=18+21

We move all terms to the left:

12a+7-4a-(18+21)=0

We add all the numbers together, and all the variables

12a-4a+7-39=0

We add all the numbers together, and all the variables

8a-32=0

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

8a=32

a=32/8

a=4

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