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4a + 2n= 1550
4a+3n=1450
-4a-2n=-1550
____________
n=-100
4a+3n =1450
4a+3(-100)=1450
4a-300=1450
4a=1750
a=437.5
comprobando
4a+2n=1550
4(437.5)+2(-100)=1550
1750-200 =1550
1550=1550