90-x=10-3x

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Solution for 90-x=10-3x equation: 



90-x=10-3x

We move all terms to the left:

90-x-(10-3x)=0

We add all the numbers together, and all the variables

-x-(-3x+10)+90=0

We add all the numbers together, and all the variables

-1x-(-3x+10)+90=0

We get rid of parentheses

-1x+3x-10+90=0

We add all the numbers together, and all the variables

2x+80=0

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

2x=-80

x=-80/2

x=-40

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