-x+40=30

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Solution for -x+40=30 equation: 



-x+40=30

We move all terms to the left:

-x+40-(30)=0

We add all the numbers together, and all the variables

-1x+10=0

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

-x=-10

x=-10/-1

x=+10

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