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53=15-19f
We move all terms to the left:
53-(15-19f)=0
We add all the numbers together, and all the variables
-(-19f+15)+53=0
We get rid of parentheses
19f-15+53=0
We add all the numbers together, and all the variables
19f+38=0
We move all terms containing f to the left, all other terms to the right
19f=-38
f=-38/19
f=-2
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