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Sagot :

TEGMAN

(x*2)/(9*2)-(x*9)/(9*2)=-7

2x/18-9x/18=-7

-7x/18 (*18)=-7 (*18)

-7x=-126

x=18

 

x/10=5x/10-80/10

4x/10=80/10

4x=80

x=20

 

3x/15=5x/15-30/15

2x/15=30/15

2x=30

x=15

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