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okay when the signs are different ADD but when the same TAKE AWAY :)
you could make 2 of the values the same and then subtract,
e.g. A- 2a + 3b = 12 and B- 2a + 5b = 18 B-A 2b = 6
then substitute in the answer :) hope that helpful, don't know if thats what you were looking for?
take the second equation away from the first =D