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x-3=21-3x
x+3x=21+3
4x=24
x=24/4
x=6
b)12x-8=9x+4
12x-9x=4+8
3x=12
x=12/3
x=4
x - 3 = 21 - 3x
x + 3x = 21 + 3
4x = 24
x = 24/4
x = 6
El valor de x es 6
12x - 8 = 9x + 4
12x - 9x = 4 + 8
3x = 12
x = 12/3
x = 4
El valor de x es 4