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Aflati "X" din : [( X + 3 ) x 3 + 3 ] x 3 + 3 = 102 ;

Răspuns :

[[ ( x + 3 ) x 3 + 3 ] x 3 + 3 = 102
( 3 x + 9 + 3 ) x 3 = 102 - 3
(  3 x + 12) x 3 =99
9 x + 36 = 99
9x = 99 - 36
9 x = 63
x = 63 : 9
x = 7

 
[(x+3)*3+3]*3+3=102
(3x+9+3)*3=102-3
(3x+12)*3=99
9x+36=99
9x=99-36
9x=63
x=63/9 
x = 7