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3[x-4y]+7[2x-y]=10,5
3x-12y+14x-7y=10,5
17x-19y=10,5----------1
La juntamos con la ecuación: 4x-3y=4
(-4) 17x-19y=10,5------1
(17) 4x-3y = 4----------2
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-68x+76y = -42
68x-51y = 68
----------------------
/ 25y = 26
y = 26/25
Calculamos "x" en: 14x-3y=4
14x-3(26/25)=4
350x-78 = 100
350x = 178
x = 178/350 = 89/175
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