9(-a-10)-80=420

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Solution for 9(-a-10)-80=420 equation: 



9(-a-10)-80=420

We move all terms to the left:

9(-a-10)-80-(420)=0

We add all the numbers together, and all the variables

9(-1a-10)-80-420=0

We add all the numbers together, and all the variables

9(-1a-10)-500=0

We multiply parentheses

-9a-90-500=0

We add all the numbers together, and all the variables

-9a-590=0

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

-9a=590

a=590/-9

a=-65+5/9

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