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Stiind ca x=14calculati a+b an fiecare din cazurile:7*a+7*b+7*x=700

Răspuns :

7*a+7*b+7*x=700
7*(a+b+x)=700
a+b+x=100
a+b+14=100
a+b=100-14
a+b=86
7*a+7*b+7*x=700
7*(a+b+x)=700
a+b+x=700:7=100
a+b+14=100
a+b=100-14
a+b=86