-243=-90+x

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Solution for -243=-90+x equation: 



-243=-90+x

We move all terms to the left:

-243-(-90+x)=0

We add all the numbers together, and all the variables

-(x-90)-243=0

We get rid of parentheses

-x+90-243=0

We add all the numbers together, and all the variables

-1x-153=0

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

-x=153

x=153/-1

x=-153

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