Question

как решить (63-y)+109 =121

Answer 1

(63-y) + 109 = 121
(63-y) = 121 - 109
63 - y = 12
у= 63 - 12

у= 51

Answer 2

$(63-y)+109=121\63-y=121-109\63-y=12\-y=12-63\-y=-51\y=51$