3a+(a-15)=225

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Solution for 3a+(a-15)=225 equation: 



3a+(a-15)=225

We move all terms to the left:

3a+(a-15)-(225)=0

We get rid of parentheses

3a+a-15-225=0

We add all the numbers together, and all the variables

4a-240=0

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

4a=240

a=240/4

a=60

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