2.5a-15=4a

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Solution for 2.5a-15=4a equation: 



2.5a-15=4a

We move all terms to the left:

2.5a-15-(4a)=0

We add all the numbers together, and all the variables

-1.5a-15=0

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

-1.5a=15

a=15/-1.5

a=-10

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