2x(x - 2) + 3x = -3(3x + 1)
2x2 - 4x + 3x = -9x - 3
2x2 - x = -9x - 3
2x2 + 8x = -3
2x2 + 8x + 3 = 0
a = 2, b = 8, c = 3
x = [ -b +/- sqrt( b2 - 4ac ) ] / ( 2a )
x = [ -8 +/- sqrt( 82 - 4·2·3 ) ] / ( 2·2 )
x = [ -8 +/- sqrt( 64 - 24 ) ] / 4
x = [ -8 +/- sqrt( 40 ) ] / 4
x = [ -4 +/- sqrt( 10 ) ] / 2