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daca x+3x-8x=28 atunci x=..........

Răspuns :

x+3x-8x=28
4x-8x=28
-4x=28
-x=28:4=7 *(-1)
x=-7
   
[tex]\displaystyle \\ x + 3x - 8x = 28 \\ -4x = 28 \\ \\ x = \frac{28}{-4} = \boxed{- 7}[/tex]