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3(x^2 + 8x + 16) + 6x = 3x^2 + 7
3x^2 + 24x + 48 + 6x = 3x^2 + 7
3x^2 - 3x^2 + 24x + 6x + 48 = 7
30x + 48 - 7 = 0
30x + 41 =0
30x = -41
x= -41/30
la comprobación es remplazando x nada mas