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k=-10/40
We move all terms to the left:
k-(-10/40)=0
We get rid of parentheses
k+10/40=0
We multiply all the terms by the denominator
k*40+10=0
Wy multiply elements
40k+10=0
We move all terms containing k to the left, all other terms to the right
40k=-10
k=-10/40
k=-1/4
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