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2x+4+(3x-4)=3x+12
2x + 4 + 3x - 4 = 3x + 12
2x + 3x + 4 - 4 = 3x + 12
5x = 3x + 12
5x - 3x = 12
2x = 12
x = 12/2
x = 6
Respuesta
x = 6
2x+4+3x-4=3x+12
5x=3x+12
5x-3x=12
2x=12
x=12/2
x=6