100=-80+4x

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Solution for 100=-80+4x equation: 



100=-80+4x

We move all terms to the left:

100-(-80+4x)=0

We add all the numbers together, and all the variables

-(4x-80)+100=0

We get rid of parentheses

-4x+80+100=0

We add all the numbers together, and all the variables

-4x+180=0

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

-4x=-180

x=-180/-4

x=+45

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