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16.2k-64.8+6.4k+19.2=-136
We move all terms to the left:
16.2k-64.8+6.4k+19.2-(-136)=0
We add all the numbers together, and all the variables
22.6k+90.4=0
We move all terms containing k to the left, all other terms to the right
22.6k=-90.4
k=-90.4/22.6
k=-4
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