z+4-3=2z
z-2z+4=3
-z+4=3
4-z=3
z=1
7-3z+4z-9=0
7-3z+4z=9
7+z=9
z=2
10x-3+5=x+3x
10x-3+5=4x
10x+2=4x
10x-4x=-2
6x=-2
x=-1/3
3x-2=5x+10
-10-2=5x-3x
-12=2x
2x=-12
x=-6
z+4-3=2z
z-2z+4=3
-z+4=3
4-z=3
z=1
7-3z+4z-9=0
7-3z+4z=9
7+z=9
z=2
10x-3+5=x+3x
10x-3+5=4x
10x+2=4x
10x-4x=-2
6x=-2
x=-1/3
3x-2=5x+10
-10-2=5x-3x
-12=2x
2x=-12
x=-6