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Aflati numarul a daca: 6150-50 x [39+2x(7x a-9)]=3000

Răspuns :

6150-50 x [39+2x(7x a-9)]=3000
50 x [39+2x(7x a-9)]=6150 - 3000
50 x [39+2x(7x a-9)]=3150
39+2x(7a-9)= 3150:50
39+2x(7a-9)=63
2x(7a-9)=63-39
7a-9=24:2
7a-9=12
7a=12+9
7a=21
a=21:7
a=3
6150-50×[39+2x(7x a-9)]=3000
50×[39+2x(7x a-9)] = 6150-3000
50×[39+2x(7x a-9)] = 3150
39+2x(7x a-9) = 3150:50
39+2x(7x a-9) = 63
2×(7×a-9) = 63-39
2×(7×a-9) = 24
7×a-9 = 24:2
7×a-9 = 12
7×a = 12+9
7×a = 21
a = 21:7
a = 3