40-x=2(7-7x)

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Solution for 40-x=2(7-7x) equation: 



40-x=2(7-7x)

We move all terms to the left:

40-x-(2(7-7x))=0

We add all the numbers together, and all the variables

-x-(2(-7x+7))+40=0

We add all the numbers together, and all the variables

-1x-(2(-7x+7))+40=0



We calculate terms in parentheses: -(2(-7x+7)), so:

2(-7x+7)

We multiply parentheses

-14x+14

Back to the equation:

-(-14x+14)



We get rid of parentheses

-1x+14x-14+40=0

We add all the numbers together, and all the variables

13x+26=0

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

13x=-26

x=-26/13

x=-2

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