方程组6X-3Y+4X-12Y=5 6X+2Y-3X-3Y=12怎么化简啊?

解方程组：x+y/2+x-y/3=6 4(x+y)-5(x-y)=12 1/2x-2y=-74,x-6y=-12解方程组,x／5-y／2=2,2x+3y=4解方程组 用换元法解方程组 2分之x+y+3分之x-y=6 2(x+y)+(x-y)=12 x+y/2+x-y/3=6,4(x+y)-5(x-y)=2用加减消元法解方程组 解方程组 {(x+y)/2+(x-y)/3=6 5(x+y)-2(x-y)=4 解方程组 X+Y/2+X-Y/3=6 4[X+Y]-5[X-Y]=2 解方程组X+Y/2=3X-2Y=10+6X+Y/4 解二元一次方程组:{5(x+y)+3(x-y)=2{7(x+y)-3(x-y)=-6 解方程组 x-y/3-x+y/4=2 x-y/6-x+y/8=3 解方程组：2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16 3(x+y)—4(x-y)=4,(x+y/2)+(x-y/6)=1.解方程组 一道二元一次方程组!3(x+y)-4(x-y)=4,(x+y)/2+(x-y)/6=1