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(B2O3) = A
(Mg) = B
(MgO) = C
(B) = D
B: 2A = D
Mg: B = C
O: 3A = C
A = 2
2A = D
2(2)= D
D = 4
3A = C
3(2) = C
C = 6
B = C
B = 6
A = 2 B = 6 C = 6 D= 4
2B2O3 + 6Mg ---> 6MgO + 4B
B2O3 + 3Mg ---> 3MgO + 2B