Aflal pe x din egalitatea 5-[x:3-7•(24+30:5)]-23=27

Răspuns :

5 · [ x : 3 - 7 • ( 24 + 30 : 5 ) ] - 23 = 27

5 · [ x : 3 - 7 • ( 24 + 6 ) ] = 27 + 23

5 · ( x : 3 - 7 · 30 ) = 50

x : 3 - 210 = 50 : 5

x : 3 = 10 + 210

x : 3 = 220

x = 220 × 3

x = 660

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Verific:  

5 × ( 660 : 3 - 210 ) - 23  = 5 × ( 220 - 210 ) - 23 = 5 × 10 - 23 = 50 - 23 = 27