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2x=9-3
2x=6
x=6/2
x=3
b) 3x-5=10
3x=10+5
3x=15
x=5
c) x+4=7
x=7-4
x=3
d) 2+7x-3x=18
4x=18-2
4x=16
x=4
e) 9+5x+7 falta datos
f) 10x-5-2x=9+5x+7
8x-5x=16+5
3x=21
x=7