75=15-3a

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Solution for 75=15-3a equation: 



75=15-3a

We move all terms to the left:

75-(15-3a)=0

We add all the numbers together, and all the variables

-(-3a+15)+75=0

We get rid of parentheses

3a-15+75=0

We add all the numbers together, and all the variables

3a+60=0

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

3a=-60

a=-60/3

a=-20

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