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Respuesta:
7x - (3x+3) = 21
el menos multiplica, entonces se intercambian signos
7x -3x-3 = 21hacemos la operación de las x
4x-3=21
despejamos x
4x= 21+3
x=24/4
x=6
2) 12 - (6x - 7) = 11
12 -6x + 7 = 11
-6x + 19 = 11
-6x= -8
x=-8/-6
x= 4/3
3) 5t + 8 = 2t+26
despejamos la x a un solo lado
5t-2t = 26-8
3t=18
t=18/3
t=6