a; a + 2 = doua numere naturale impare consecuutive
( 1 375 - 497) + ( 87 : 3) - a × ( a + 2) = 764
878 + 29 - a × ( a + 2) = 764
907 - a × ( a + 2) = 764
a × ( a + 2) = 907 - 764
a × ( a + 2) = 143
11 × 13 = 143
a = 11
b = 13
a + b = 11 + 13 = 24 ( suma )
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