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Método de Sustitución:
x=25+17y
3(25+17y)+12y=-6
75+51y+12y=-6
63y=-6-75
63y=-81
y=-81/36
y=-9/4=2,25
x=25+17y
x=25+17(-9/4)
x=(100-153)/4
x=-53/4 = -13,25