3x+21=(x+7)

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Solution for 3x+21=(x+7) equation:



3x+21=(x+7)
We move all terms to the left:
3x+21-((x+7))=0
We calculate terms in parentheses: -((x+7)), so:
(x+7)
We get rid of parentheses
x+7
Back to the equation:
-(x+7)
We get rid of parentheses
3x-x-7+21=0
We add all the numbers together, and all the variables
2x+14=0
We move all terms containing x to the left, all other terms to the right
2x=-14
x=-14/2
x=-7

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