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ma poate ajuta cineva ??[300-(27:X+51:X+4)x7]x7=630

Răspuns :

[300-(27:X+51:X+4)x7]x7=630
300-(78:x+4)x7=630:7
300-(78:x+4)x7=90
(78:x+4)x7=300-90
(78:x+4)x7=210
(78:x+4)=210:7
78:x+4=30
78:x=30-4
78:x=26
x=78:26
x=3