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bonjour

-3(x+2)² = -3x²+8
-3(x²+4x+4) +3x²-8 =0
-3x²-12x-12+3x²-8 =0
-12x -20 =0
-12x =20
x = -20/12
x =  -4/3


3(x-1)² -(2x+1)(x-1) =0
(x-1)(3x-3-2x-1) =0
(x-1)(x-4) =0

x-1 =0                   x-4 =0
x = 1                      x = 4


(4x-1) = 4(3x+2)
4x-1 = 12x+8
4x -12x = 8+1
-8x = 9
x = -9/8