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456-(190*28-263*19)-7*a=9*10+1

Răspuns :

456-(5320-4997)-7a = 91 => 456-323-7a = 91 => 142-7a = 91 => 7a = 51 => a = 51/7
456-(190*28-263*19)-7a=9*10+1
456-(5320-4997)-7a=91
456-323-7a=91
133-7a=91
133-91=7a
42=7a
a=42:7
a=6