|15+у|<6
эквивалентно системе
15+у<6
15+у>-6
====
y < -9
y > -21
y ∈ (-21, -9)
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|15+у|<6
эквивалентно системе
15+у<6
15+у>-6
====
y < -9
y > -21
y ∈ (-21, -9)