(1) 方程两边同时乘以5,得
12-2(y-4)=3y
12-2y+8=3y
12+8=3y+2y
20=5y
y=4
(2)方程两边同时乘以6,得
6-2(x-1)=6x-(x+1)
6-2x+2=6x-x-1
-2x-6x+x=-1-6-2
-7x=-9
x=9/7
(1) 方程两边同时乘以5,得
12-2(y-4)=3y
12-2y+8=3y
12+8=3y+2y
20=5y
y=4
(2)方程两边同时乘以6,得
6-2(x-1)=6x-(x+1)
6-2x+2=6x-x-1
-2x-6x+x=-1-6-2
-7x=-9
x=9/7