Respuesta :

MiniTIgra

Answer:

a=28

Step-by-step explanation:

a = 2b - c

a = 2(12) - (-4)

a = 24 + 4

a = 28

by the formula

a=2b-c

if b =12

so, a= 2*12-(-4)

a= 24+4

a=28

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