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8x+45=21
8x=21-45
8x= -24
x= -24/8
x= -3
8x + 15y = 21 Para y = 3
8x + 15(3) = 21
8x + 45 = 21
8x = 21 - 45
8x = - 24
x = - 24/8
x = - 3
Respuesta.
x = - 3