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Determinati x din egalitatea : 1+2x{3+[(4+x):5-6]-7}-8=9

Răspuns :

1+2×{3+[(4+x):5-6]-7}-8=9
2×{3+[(4+x):5-6]-7}=9 +8-1
2×{3+[(4+x):5-6]-7}=16
3+[(4+x):5-6]-7=8
(4+x):5-6=8-3+7
(4+x):5-6=12
(4+x):5=12+6
(4+x):5=18
4+x=90
x=86