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3.489=-0.53k
We move all terms to the left:
3.489-(-0.53k)=0
We get rid of parentheses
0.53k+3.489=0
We move all terms containing k to the left, all other terms to the right
0.53k=-3.489
k=-3.489/0.53
k=-6+0.309/0.53
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