15+4a-6=21,a=

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Solution for 15+4a-6=21,a= equation: 



15+4a-6=21.a=

We move all terms to the left:

15+4a-6-(21.a)=0

We add all the numbers together, and all the variables

4a-(+21.a)+15-6=0

We add all the numbers together, and all the variables

4a-(+21.a)+9=0

We get rid of parentheses

4a-21.a+9=0

We add all the numbers together, and all the variables

-17a+9=0

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

-17a=-9

a=-9/-17

a=9/17

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