Hi,

factor and solve using the zero principle

3x^2+8x=9+2x 

3x^2+ 6x - 9 =0

factoring

(3x + 9)(x - 1)= 0  Note sum of inner product(9x) and outer product(-3x) = 6x

using the zero principle

(3x + 9)=0

x = -3

(x + 1)= 0 

x = -1 

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