<a href="" class="link">Ссылка</a>
<a href="" class="link2">Ссылка</a>
<a href="" class="link3">Ссылка</a>
@mixin redBigLink {
  font-size: 40px;
  color: red;
}

.link {
  @include redBigLink;
}

.link2 {
  @include redBigLink;
}

.link3 {
  @include redBigLink;
}
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