Answer:
It will be 4
Steps:
1+ 3(4f-7)= 28
3(4f-7)=28-1=27
(4f-7)=27÷3=9
4f=9+7=16
f=16÷4=4
f = 4
Explanation:
1 + 3(4f - 7) = 28 ( subtract 1 from both sides )
3(4f - 7) = 27 ( divide both sides by 3 )
4f - 7 = 9 ( add 7 to both sides )
4f = 16 ( divide both sides by 4 )
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