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40+14f=2(-4f-13)
We move all terms to the left:
40+14f-(2(-4f-13))=0
We calculate terms in parentheses: -(2(-4f-13)), so:We get rid of parentheses
2(-4f-13)
We multiply parentheses
-8f-26
Back to the equation:
-(-8f-26)
14f+8f+26+40=0
We add all the numbers together, and all the variables
22f+66=0
We move all terms containing f to the left, all other terms to the right
22f=-66
f=-66/22
f=-3
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