21-15=(x-1)

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Solution for 21-15=(x-1) equation: 



21-15=(x-1)

We move all terms to the left:

21-15-((x-1))=0

We add all the numbers together, and all the variables

-((x-1))+6=0



We calculate terms in parentheses: -((x-1)), so:

(x-1)

We get rid of parentheses

x-1

Back to the equation:

-(x-1)



We get rid of parentheses

-x+1+6=0

We add all the numbers together, and all the variables

-1x+7=0

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

-x=-7

x=-7/-1

x=+7

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