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12X+8X= 20X - 5
50x = -9
x= -9/50
X= .18
17x + 13x - 4 = 12x + 8x - 5
30x - 4 = 20x - 5
30x - 20x = - 5 + 4
10x = - 1
x = -1/10
Solución :
x = -1/10