Решите каждое уравнение двумя способами: а) (х+98) + 14 = 169
х+98=... - ...
х+98 = ...
х = ...

(и еще вторым способом)

(х+98)+14=169
х+ ...+ ... = 169
х+ ... = 169

б) (35+у) - 15 = 3135+у = 31 ... 15
35+у= ...
у = ...

(и вторым способом)
(35+у) - 15 = 31
(35 - ...) + у = 31
... + у = 31
у = ...
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