3=80-x,7=90-2x

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Solution for 3=80-x,7=90-2x equation: 



3=80-x.7=90-2x

We move all terms to the left:

3-(80-x.7)=0

We add all the numbers together, and all the variables

-(-x.7+80)+3=0

We get rid of parentheses

x.7-80+3=0

We add all the numbers together, and all the variables

x.7-77=0

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

x.7=77

x=77/1

x=77

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