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7000-x-420+240=8000
plss dau coroana


Răspuns :

7000-x-420 = 8000/- 240 
7000-x-420 =7760/+420
7000-x =8180 
x =-1180
[tex]7000-x-420 = \frac{8000}{-240} [/tex]
 [tex]7000-x-420+240=8000 [/tex]
[tex]7000-x-420= \frac{7760}{+420} 7000-x=8180 x=-1180[/tex]