15(3-a)+8a=80

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Solution for 15(3-a)+8a=80 equation: 



15(3-a)+8a=80

We move all terms to the left:

15(3-a)+8a-(80)=0

We add all the numbers together, and all the variables

15(-1a+3)+8a-80=0

We add all the numbers together, and all the variables

8a+15(-1a+3)-80=0

We multiply parentheses

8a-15a+45-80=0

We add all the numbers together, and all the variables

-7a-35=0

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

-7a=35

a=35/-7

a=-5

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