90-10+x=90-9x

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Solution for 90-10+x=90-9x equation: 



90-10+x=90-9x

We move all terms to the left:

90-10+x-(90-9x)=0

We add all the numbers together, and all the variables

x-(-9x+90)+90-10=0

We add all the numbers together, and all the variables

x-(-9x+90)+80=0

We get rid of parentheses

x+9x-90+80=0

We add all the numbers together, and all the variables

10x-10=0

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

10x=10

x=10/10

x=1

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