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[(20+399:3+a:4)x7-5x400]:3-22x3+125x8=1000

Răspuns :

[(20+133+a÷4)×7-2000]÷3-66+1000=1000
[(153+a÷4)×7-2000]÷3-66=1000-1000
[(153+a÷4)×7-2000]÷3=0+66
(153+a÷4)×7-2000=66×3
(153+a÷4)×7=198+2000
153+a÷4=2198÷7
153+a=314×4
a=1256-153
a=1103