40=90-x

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Solution for 40=90-x equation: 



40=90-x

We move all terms to the left:

40-(90-x)=0

We add all the numbers together, and all the variables

-(-1x+90)+40=0

We get rid of parentheses

1x-90+40=0

We add all the numbers together, and all the variables

x-50=0

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

x=50

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