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rezolvarea ex 2(x-1)=18

Răspuns :

2 · (x - 1) = 18 /:2
x - 1 = 9 /+1
x = 10

/robèrtinni
2(x-1)=18
2x-2=18
2x=18+2
2x=20
x=20:2
x=10