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2×(a+4×6-3×7)=24
a=?


Răspuns :

2(a+24-21)=24
2(a+3)=24
2a+6=24
2a=24-6
2a=18
a=18/2=9
2(a+24-21)=24
a+24-21=48
a=48-24+21
a=45