3a+10+a+15=125

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Solution for 3a+10+a+15=125 equation: 



3a+10+a+15=125

We move all terms to the left:

3a+10+a+15-(125)=0

We add all the numbers together, and all the variables

4a-100=0

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

4a=100

a=100/4

a=25

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