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-90=2k-2(3-5k)
We move all terms to the left:
-90-(2k-2(3-5k))=0
We add all the numbers together, and all the variables
-(2k-2(-5k+3))-90=0
We calculate terms in parentheses: -(2k-2(-5k+3)), so:We get rid of parentheses
2k-2(-5k+3)
We multiply parentheses
2k+10k-6
We add all the numbers together, and all the variables
12k-6
Back to the equation:
-(12k-6)
-12k+6-90=0
We add all the numbers together, and all the variables
-12k-84=0
We move all terms containing k to the left, all other terms to the right
-12k=84
k=84/-12
k=-7
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