15a-4a-3a=40

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Solution for 15a-4a-3a=40 equation: 



15a-4a-3a=40

We move all terms to the left:

15a-4a-3a-(40)=0

We add all the numbers together, and all the variables

8a-40=0

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

8a=40

a=40/8

a=5

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