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x²=5
x=√5 ∨ x=-√5
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5x^2-7x=0
x(5x-7)=0
x=0 ∨ 5x-7=0
5x=7 I:5
x = 7/5
x = 1 2/5
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x^2-4x=0
x(x-4)=0
x=0 ∨ x-4=0
x=4
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5x-2x^2=0
x(5-2x)=0
x=0 ∨ 5-2x=0
-2x = -5 I:(-2)
x = 5/2
x = 2 1/2
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2x^2=-9x
2x²+9x=0
x(2x+9)=0
x = 0 ∨ 2x+9=0
2x=-9 I:2
x = - 9/2
x = - 4 1/2
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