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(3x+3) (4x+1) = (6x-3) (2x+4)
12x²+3x+12x+3 = 12x²+24x-6x-12
12x²+15x+3 = 12x²+18x-12
12x²-12x²+15x-18x = -12-3
-3x = -15
x. = -15/-3
x. = 5