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2x(x-3)=0
x=0 ∨ x-3=0 x=3
b)3x+4x²=0
x(3+4x)=0
x=0 ∨ 4x=-3 x=-3/4
c)5x=10x²
10x²-5x=0
x(10x-5)=0
x=0 ∨ 10x-5=0 10x=5 x=1/2