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2x-3y=-9
X=-9+3y/2
X=-9/2+3/2y
3(-9/2+3/2y)+5(-9/2+3/2y)=15
-27/2+9/2y-45/2+15/2y=15
9/2y+15/2y=15+27/2+45/2
12y=15+36
12y=51
Y=51/12
Y=17/4
Si no me equivoco