3(500-a)+10a=3600

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Solution for 3(500-a)+10a=3600 equation: 



3(500-a)+10a=3600

We move all terms to the left:

3(500-a)+10a-(3600)=0

We add all the numbers together, and all the variables

3(-1a+500)+10a-3600=0

We add all the numbers together, and all the variables

10a+3(-1a+500)-3600=0

We multiply parentheses

10a-3a+1500-3600=0

We add all the numbers together, and all the variables

7a-2100=0

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

7a=2100

a=2100/7

a=300

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