7=-7x+3(x-7)

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Solution for 7=-7x+3(x-7) equation:



7=-7x+3(x-7)
We move all terms to the left:
7-(-7x+3(x-7))=0
We calculate terms in parentheses: -(-7x+3(x-7)), so:
-7x+3(x-7)
We multiply parentheses
-7x+3x-21
We add all the numbers together, and all the variables
-4x-21
Back to the equation:
-(-4x-21)
We get rid of parentheses
4x+21+7=0
We add all the numbers together, and all the variables
4x+28=0
We move all terms containing x to the left, all other terms to the right
4x=-28
x=-28/4
x=-7

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