(x-a)+(12-b)=18 якщо x=8
(8-а)+(12-b)=18
8-a+12-b=18
20-a-b=18
a+b=20-18
a+b=2
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(x-a)+(12-b)=18 якщо x=8
(8-а)+(12-b)=18
8-a+12-b=18
20-a-b=18
a+b=20-18
a+b=2