1) -9z+32=7z
-9z-7z=32
-16z=32
z=2
2) 10-11n=15-12n
-11n+12n=15+10
n=15-10
n=5
3) 5x+21=2x
5x-2x=-21
3x=-21
x=-7
1) -9z+32=7z
-9z-7z=32
-16z=32
z=2
2) 10-11n=15-12n
-11n+12n=15+10
n=15-10
n=5
3) 5x+21=2x
5x-2x=-21
3x=-21
x=-7