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15(k+5)=10(k+4)
We move all terms to the left:
15(k+5)-(10(k+4))=0
We multiply parentheses
15k-(10(k+4))+75=0
We calculate terms in parentheses: -(10(k+4)), so:We get rid of parentheses
10(k+4)
We multiply parentheses
10k+40
Back to the equation:
-(10k+40)
15k-10k-40+75=0
We add all the numbers together, and all the variables
5k+35=0
We move all terms containing k to the left, all other terms to the right
5k=-35
k=-35/5
k=-7
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