{(x+1)/3=(y+2)/4{(x-3)/4-(y-3)/3=三分之二
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![{(x+1)/3=(y+2)/4{(x-3)/4-(y-3)/3=三分之二](/uploads/image/z/2675286-54-6.jpg?t=%7B%28x%2B1%29%2F3%3D%28y%2B2%29%2F4%7B%28x-3%29%2F4-%28y-3%29%2F3%3D%E4%B8%89%E5%88%86%E4%B9%8B%E4%BA%8C)
{(x+1)/3=(y+2)/4{(x-3)/4-(y-3)/3=三分之二
{(x+1)/3=(y+2)/4{(x-3)/4-(y-3)/3=三分之二
{(x+1)/3=(y+2)/4{(x-3)/4-(y-3)/3=三分之二
(x+1)/3=(y+2)/4
(x-3)/4-(y-3)/3=2/3
4(x+1)-3(y+2)=0
3(x-3)-4(y-3)=8
4x-3y=2
3x-4y=5
16x-12y=8
9x-12y=15
16x-9x=8-15
7x=-7
x=-1
y=(4x-2)/3
y=[4*(-1)-2]/3
y=-2