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19+-19+8f=15+-19
We move all terms to the left:
19+-19+8f-(15+-19)=0
We add all the numbers together, and all the variables
8f+19-19+-(-4)=0
We add all the numbers together, and all the variables
8f+4=0
We move all terms containing f to the left, all other terms to the right
8f=-4
f=-4/8
f=-1/2
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