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3xa+197=221 4x3:6x5+a=100

Răspuns :

3×a+197=221
3a+197=221
3a=221-197
3a=24
a=8

4×3:6×5+a=100
12:6×5+a=100
2×5+a=100
10+a=100
a=100-10
a=90