15a-20a=30

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Solution for 15a-20a=30 equation: 



15a-20a=30

We move all terms to the left:

15a-20a-(30)=0

We add all the numbers together, and all the variables

-5a-30=0

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

-5a=30

a=30/-5

a=-6

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