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de rezolvat ecuatia 9(x-2=18

Răspuns :

9·(x-2)=18⇒9x-18=18⇒9x=18+18⇒x=36:9⇒x=4
Metoda I
9(x-2)=18
x-2=18:9
x-2=2
x=2+2
x=4

Metoda II
9(x-2)=18
9*x-9*2=18
9x-18=18
9x=18+18
9x=36
x=36:9
x=4