a=a-45+a-30

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Solution for a=a-45+a-30 equation: 



a=a-45+a-30

We move all terms to the left:

a-(a-45+a-30)=0

We add all the numbers together, and all the variables

a-(2a-75)=0

We get rid of parentheses

a-2a+75=0

We add all the numbers together, and all the variables

-1a+75=0

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

-a=-75

a=-75/-1

a=+75

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