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x-12y=x+15+1
0,2x-3y=1/-4
0x-12y=16
-0,8x+12y=-4
0x-12y=16
+ ___________
-0,8x = 12/ : -0,8
x= -15
0,2x-3y=1
0,2*(-15)-3y=1
-3-1=3y
3y= -4/:3
1
y= 1 ---
3