[tex] |x| = 21 - 3 + 12 - ( + 5) \\ |x| = 21 - 3 + 12 - 5 \\ |x| = 33 - 8 \\ |x| = 25 \\ x = + 25 \: \: sau \: \: x = - 25[/tex]
x={ -25 ; +25}
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Răspuns:
[tex] \large \bf|x|=+7 \cdot(+3)+21:(-7)-24:(-2)-(-15):(-3)[/tex]
[tex]\large \bf|x|=+21+21:(-7)-24:(-2)-(-15):(-3)[/tex]
[tex]\large \bf|x|=+21 - 3-24:(-2)-(-15):(-3)[/tex]
[tex]\large \bf|x|=+21 - 3 + 12-(-15):(-3)[/tex]
[tex]\large \bf|x|=+21 - 3 + 12-( + 5)[/tex]
[tex]\large \bf|x|=+21 - 3 + 12- 5[/tex]
[tex]\large \bf|x|=+18 + 12- 5[/tex]
[tex]\large \bf|x|=30- 5[/tex]
[tex]\large \bf|x|=25 \implies x_{1} = 25; \: \: x_{2} = - 25 [/tex]
[tex]\color {red}\Large\boxed{ \bf x \in \{-25;+ 25\}} [/tex]
