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8x-13=8(x+1)-21
We move all terms to the left:
8x-13-(8(x+1)-21)=0
We calculate terms in parentheses: -(8(x+1)-21), so:We get rid of parentheses
8(x+1)-21
We multiply parentheses
8x+8-21
We add all the numbers together, and all the variables
8x-13
Back to the equation:
-(8x-13)
8x-8x+13-13=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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