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128=2(7k+8)
We move all terms to the left:
128-(2(7k+8))=0
We calculate terms in parentheses: -(2(7k+8)), so:We get rid of parentheses
2(7k+8)
We multiply parentheses
14k+16
Back to the equation:
-(14k+16)
-14k-16+128=0
We add all the numbers together, and all the variables
-14k+112=0
We move all terms containing k to the left, all other terms to the right
-14k=-112
k=-112/-14
k=+8
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