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les cambiamos los signos a todos aquellos que cambiemos de miembro o lado
7x+x- 3x- 2x = 8 + 32 - 4 - 12 sumamos y restamos todo
3x = 24 pasamos 3 dividiendo
x = 24/3 = 8
8x+16=5x+40
3x=24
x=8