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5x+4x-2x²+3x=0
x(5+4-2x+3)=0|:5+4-2x+3x
x=0
(x-3)(x+2)=(x+4)(2-x)-14
x²-6 =(-x)²+8-14
x²+x²=6+8-14
x(x+x)=0|x+x
x=0