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51-12•(7x+2)=19 ma puteți ajuta

Răspuns :

Renatemambouko
51-12•(7x+2)=19
-12•(7x+2)=19-51
-12•(7x+2)=-32
12•(7x+2)=32
7x+2=32/12
7x=8/3-2
7x=(8-6)/3
7x=2/3
x=2/21
[tex]\displaystyle 51-12(7x+2)=19 \\ 51-84x-24=19 \\ -84x=19-51+24 \\ -84x=-8 \\ x= \frac{8}{84} \Rightarrow x= \frac{2}{21} [/tex]