#7
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1/x+x/(x+2)=1

take LCM

x+2+x^2=x(x+2)

x=2
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2)






(x+1)(x+3)=0
x= - 1, x= - 3

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3)

after solving both side u will get


3x=2x+2
x=2

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1/(x-1)(x+1)=2/(x-1)(x+2)
u will get same will cross out each other
1/(x+1)=2/(x+2)
(x+2)=2(x+1)
x+2=2x+2
x=0

It is important because sometimes ur dna needs to multiply