7+(x-3y)/4=2x-(y+5)/3,[10(x-y)-4(1-x)]/3=y帮解一下啊!

7+(x-3y)/4=2x-(y+5)/3
[10(x-y)-4(1-x)]/3=y
去分母
7*12+3(x-3y)=12*2x-4(y+5)
10(x-y)-4(1-x)=3y
整理得：
21x+5y=104
14x-13y=4
①*2 ②*3得
42x+10y=208
42x-39y=12
解得 y=4
x=4
③④⑤