S1 - how do they know that this equals 4?
Where do they get the 4 from? I followed it all up to the 4= part where I am lost.
Original post by blobbybill
Where do they get the 4 from? I followed it all up to the 4= part where I am lost.
By subtracting the two equations referenced by the line on the left with a minus sign next to it.
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