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x²-5x=0
x(x-5)=0
x=0∨x=5
2x²=6x=0
2x(x+3)=0
x=0∨x=-3
x²-3/4x=0
x(x-3/4)=0
x=0∨x=3/4
x²+3,2x=0
x(x+3,2)=0
x=0∨x=-3,2