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3x+4y=8
3x=8-4y
A) x=8-4y/3
8x-9y=-77
8x=-77+9y
B) x=-77+9y/8
entonces coloco ambos resultados
x=8-4y/3 = x=-77+9y/8
8(8-4y)= 3(-77+9y)
64-32y = -231+27y
-32y-27y = -64-231
59y=167
y=167/59