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2x-21,135=x-18,68 cum se calculeaza?

Răspuns :

2x-21,135=x-18,68
2x-x=21,135-18,68
x=2,455
2x-21,135=x-18,68
21,135-18,68=2x-1
21,135-18,68=x
2,455=x
x=2,455