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Best Answer
Bring all the unknown values to one side and the known values to the other
7s - 12 = 3s - 4
Subtract 3s from both sides
7s - 3s - 12 = 4
4s - 12 = 4
Add 12 to both sides
4s = 4 + 12
4s = 16
Divide both sides by 4
s = 4
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