15+10a=225

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Solution for 15+10a=225 equation: 



15+10a=225

We move all terms to the left:

15+10a-(225)=0

We add all the numbers together, and all the variables

10a-210=0

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

10a=210

a=210/10

a=21

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