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Determinați numarul natural x din : 207 - ( x + 2 ) ori 7 + 33 egal 100 .

Răspuns :

207-(X+2)×7+33=100
207-(X+2)×7=100-33
207-(X+2)×7=67
(X+2)×7=207-67
(X+2)×7=140
X+2= 140:7
X+2=20
X=20-2
X=18
207-7x-14 + 33 = 100
7x=207-100-14+33=126
x=126:7=18
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Verificare: 207-20x7 + 33 = 207-140 + 33= 67+33=100 OK.
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Succes in continuare!