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(136.71*4)+f=585.34
We move all terms to the left:
(136.71*4)+f-(585.34)=0
We add all the numbers together, and all the variables
f+(546.84)-(585.34)=0
We add all the numbers together, and all the variables
f-38.5=0
We move all terms containing f to the left, all other terms to the right
f=38.5
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