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-23x-21=-5(5x+5)
We move all terms to the left:
-23x-21-(-5(5x+5))=0
We calculate terms in parentheses: -(-5(5x+5)), so:We get rid of parentheses
-5(5x+5)
We multiply parentheses
-25x-25
Back to the equation:
-(-25x-25)
-23x+25x+25-21=0
We add all the numbers together, and all the variables
2x+4=0
We move all terms containing x to the left, all other terms to the right
2x=-4
x=-4/2
x=-2
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