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21-5x=-3x-(-x+3)
We move all terms to the left:
21-5x-(-3x-(-x+3))=0
We add all the numbers together, and all the variables
-5x-(-3x-(-1x+3))+21=0
We calculate terms in parentheses: -(-3x-(-1x+3)), so:We get rid of parentheses
-3x-(-1x+3)
We get rid of parentheses
-3x+1x-3
We add all the numbers together, and all the variables
-2x-3
Back to the equation:
-(-2x-3)
-5x+2x+3+21=0
We add all the numbers together, and all the variables
-3x+24=0
We move all terms containing x to the left, all other terms to the right
-3x=-24
x=-24/-3
x=+8
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