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x(x-5)=0 ⇔ x=0 ∨x-5=0
x=5
x=0 ∨ x=5
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2x²+4x=0
2x(x+2)=0 ⇔ 2x=0 ∨ x+2=0
x=0 ∨ x=-2
x=0 ∨ x= -2
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7x²-3,5x=0
3,5x(2x-1)=0 ⇔ 3,5x=0 ∨ 2x-1=0
x=0 ∨ 2x=1/:2
x=1/2
x=0 ∨ x=1/2
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50x-8x²=0
2x(25-4x)=0 ⇔ 2x=0 ∨ 25-4x=0
x=0 ∨ 25=4x/:4
x=25/4
x=0 ∨ x=25/4
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x²/5=3x=2
2x²=15x
2x²-15x=0
x(2x-15)=0 ⇔ x=0 ∨ 2x-15=0
2x=15/:2
x=7,5
x=0 ∨ x=7,5
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(x²-5x)/2=(5x-x²)/3 //*6 obustronnie mnozymy przez 6
3(x²-5x)=2(5x-x²)
3x²-15x=10x-2x²
3x²+2x²-15x-10x=0
5x²-25x=0
5x(x-5)=0 ⇔ 5x=0 ∨ x-5=0
x=0 ∨x=5
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2-(x²-x+5)/3=1/3 //*3
6-(x²-x+5)=1
6-x²+x-5-1=0
-x²+x=0
-x(x-1)=0 ⇔ -x=0 ∨x-1=0
x=0 ∨ x=1
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[2(x²-5)+10(1-2x)]/5=x² //*5
2(x²-5)+10(1-2x)=5x²
2x²-10+10-20x=5x²
2x²-5x²-20x=0
-3x²-20x=0
-x(3x+20)=0 ⇔ -x=0 ∨3x+20=0
x=0 ∨ 3x= -20/:3
x= -20/3
x=0 ∨ x= -20/3
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(1-x²)/2+(2x²-1)/2=(x²+x)/4 //*4
2(1-x²)+2(2x²-1)=x²+x
2-2x²+4x²-2-x²-x=0
x²-x=0
x(x-1)=0 ⇔ x=0 ∨ x-1=0
x=1
x=0 ∨ x=1
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(x²+2x)/3+(x²+3x)/2=0 //*6
2(x²+2x) +3(x²+3x)=0
2x²+4x+3x²+9x=0
5x²+13x=0
x(5x+13)=0 ⇔ x=0 ∨ 5x+13=0
5x= -13/:5
x= -5/13
x=0 ∨ x= -5/13