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MsdrussuSoarece
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ecuatie 3(157-3x)-79=131

Răspuns :

[tex]\displaystyle 3(157-3x)-79=131 \\ 471-9x-79=131 \\ -9x=131-471+79 \\ -9x=-261 \\ x= \frac{-261}{-9} \\ x=29[/tex]
3(157-3X)-79=131⇒471-9X-79=131⇒471-9X=131+79⇒471-9X=210⇒-9X=210-471⇒-9X=-261⇒X=29