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22.8+8(18)=f
We move all terms to the left:
22.8+8(18)-(f)=0
We add all the numbers together, and all the variables
-1f+840.8=0
We move all terms containing f to the left, all other terms to the right
-f=-840.8
f=-840.8/-1
f=840+0.79999999999995/1
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