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x-4x+7=5x-(x+21)
We move all terms to the left:
x-4x+7-(5x-(x+21))=0
We add all the numbers together, and all the variables
-3x-(5x-(x+21))+7=0
We calculate terms in parentheses: -(5x-(x+21)), so:We get rid of parentheses
5x-(x+21)
We get rid of parentheses
5x-x-21
We add all the numbers together, and all the variables
4x-21
Back to the equation:
-(4x-21)
-3x-4x+21+7=0
We add all the numbers together, and all the variables
-7x+28=0
We move all terms containing x to the left, all other terms to the right
-7x=-28
x=-28/-7
x=+4
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