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10:{[10+10×(a-10)]:10-10}=21-20:2-10

Răspuns :

(10+10a-100)/10 = (10a-90)/10 = 10(a-9)/10

10/(a-9-10)=21-10-10
10/a-19=1 => a-19=10 => a=29
10:{[10+10×(a-10)]:10-10}=21-20:2-10
10:{[10+10×(a-10)]:10-10}=21-10-10
10:{[10+10×(a-10)]:10-10}=11-10
10:{[10+10×(a-10)]:10-10}=1
[10+10×(a-10)]:10-10=10:1
[10+10×(a-10)]:10-10=10
[10+10×(a-10)]:10=10+10
[10+10×(a-10)]:10=20
10+10×(a-10)=20×10
10+10×(a-10)=200
10×(a-10)=200-10
10×(a-10)=190
a-10=190:10
a-10=19
a=10+19
a=29
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