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determinati numarul natural x din :23-2*[15-(74-2*x)/4+3]=9




Răspuns :

23-2·[15-(74-2·x)÷4+3]=9 ⇔2·[15-(74-2·x)÷4+3]=23-9=14⇔[15-(74-2·x)÷4+3]=14÷2=7⇔15-(74-2·x)÷4=7-3=4⇔(74-2·x)÷4=15-4=11⇔(74-2·x)=11·4=44⇔2·x=74-44⇔2·x=30⇔x=30÷2⇔x=15