30=(x-40)

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Solution for 30=(x-40) equation: 



30=(x-40)

We move all terms to the left:

30-((x-40))=0



We calculate terms in parentheses: -((x-40)), so:

(x-40)

We get rid of parentheses

x-40

Back to the equation:

-(x-40)



We get rid of parentheses

-x+40+30=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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