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a-2b=8
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5a=26
a=26/5
2a+b=9
-2a+4b= -16 (2)
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5b=-7
b=-7/5
a-2b = 8 ....... II
4a +2b = 18
a - 2b = 8
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5a = 26
a = 26/5 ....... III
III en I
2a + b = 9