SOLUTION: 3.5 + f = 1.2

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Question 554370: 3.5 + f = 1.2
Answer by Maths68(1474) About Me  (Show Source):
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3.5%2Bf=1.2
3.5%2Bf-3.5=1.2-3.5
cross%283.5%29%2Bf-cross%283.5%29=1.2-3.5
f=-2.3

Check
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Put the value of f in original equation
3.5%2B%28-2.3%29=1.2
3.5-2.3=1.2
1.2=1.2