3a+4.5a=15

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Solution for 3a+4.5a=15 equation: 



3a+4.5a=15

We move all terms to the left:

3a+4.5a-(15)=0

We add all the numbers together, and all the variables

7.5a-15=0

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

7.5a=15

a=15/7.5

a=2

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