1-2(x+2y)=5x+12y
6(х-4у)=5(3х+4у)-13
6(x-4y)=5(3x+4y)-13
6x-24y-(15x+20y)+13=0
-9x-44y+13=0
y=-(9x-13)/44
1-2(x+2y)=5x+12y
1-2(x+2*(-(9x-13)/44))=5x+12*(-(9x-13)/44)
1-13//11x-13//11-5x-12*(-(9x-13)/44)=0
-2//11-68//11x-12*(-(9x/44-13/44))=0
-2//11-68//11x-12*(-(9//44x-13//44))=0
-2//11-68//11x-(-27//11x+39//11)=0
-2//11-41//11x-39//11=0
-41//11-41//11x=0
x=(-41//11)/(41//11)
x=-1
6(x-4y)=5(3x+4y)-13
6((-1)-4y)=5(3*(-1)+4y)-13
-6-24y-5*(-3+4y)+13=0
-6-24y+15-20y+13=0
9-44y+13=0
22-44y=0
y=-(-22)/44
y=22/44
y=0.5
Ответ: x=-1; y=0.5.