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x = 8
4x + 2k = - 20
4 (8) + 2k = - 20
32 + 2k = - 20
2k = - 20 - 32
2k = - 52
k = -52/2
k = - 26
Solución :
k = - 26
sacas mitad
2x + k = -10
x= 8
2(8) + k = -10
16 + k = -10
k = -26