x+40=2x-30

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Solution for x+40=2x-30 equation: 



x+40=2x-30

We move all terms to the left:

x+40-(2x-30)=0

We get rid of parentheses

x-2x+30+40=0

We add all the numbers together, and all the variables

-1x+70=0

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

-x=-70

x=-70/-1

x=+70

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