7+x=(42+x)*2

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Solution for 7+x=(42+x)*2 equation: 



7+x=(42+x)*2

We move all terms to the left:

7+x-((42+x)*2)=0

We add all the numbers together, and all the variables

x-((x+42)*2)+7=0



We calculate terms in parentheses: -((x+42)*2), so:

(x+42)*2

We multiply parentheses

2x+84

Back to the equation:

-(2x+84)



We get rid of parentheses

x-2x-84+7=0

We add all the numbers together, and all the variables

-1x-77=0

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

-x=77

x=77/-1

x=-77

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