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13. Cross multiply: 2 (f +3) = 7 * 12
2f + 6 = 84
2f + 6 - 6 = 84 - 6 (subtract 6 from both sides)
2f = 78
f = 39 (78 divided by 2)
14. Cross Multiply: -2d = 3 * 5
-2d = 15
d = -15/2 or -7 and 1/2
16. Cross Multiply -4x = 7 * 9
-4x = 63
x = -15.75
17. s - 2 = 21 (when cross multiplied)
s = 23 (add 2 to both sides)
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