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3x+9=29-x
3x+x=29-9
4x=20
x=5
B) 4x-4+7x=73
11x-4=73
11x=73+4
11x=77
x=7
C) 23x+7x-21=2x+22
2+7x=2x+22
7x-2x=22-2
5x=20
x=4
D) 5 (12x)-8=6-12x+17
60x-8=23-12x
60x+12x=23+8
72x=31
x= 31/72
E) 5x-9=21+2x
5x-2x=21+9
3x=30
x=10