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(a-15)x2-[9x2-24:4+(100-9x5)x0]=12


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Răspuns :

(a-15)x2-[9x2-24:4+(100-9x5)x0]=12
(a-15)x2-[9x2-24:4+(100-45)x0]=12
a-15)x2-[9x2-24:4+55x0]=12
(a-15)x2-[18-6+0]=12
(a-15)x2-12=12\\+12
(a-15)x2=24\\:2
a-15=6
a=15+6
a=21

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(a-15)x2-[9x2-24:4+(100-45)x0]=12
(a-15)x2-[9x2-24:4+55x0]=12
(a-15)x2-[18-6+0]=12
(a-15)x2-12=12
(a-15)x2=12+12=24
a-15=24:2=12
a=15+12
a=27