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a+b=(a-b)x4
a+b+a-b=200
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a=?, b=?
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Răspuns :

2a=200
a=200:2
a=100
100 +b = (100-b) x4
100 +b = 400-4b
b+4b = 400-100
5b=300
b=300:5
b=60