Subtract 4.3 from both sides
-2.9 - 4.3 = 3f
Simplify -2.9 - 4.3 to -7.2
-7.2 = 3f
Divide both sides by 3
-7.2/3 = f
Simplify 7.2/3 to 2.4
-2.4 = f
Switch sides
f = -2.4
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