<div class="cross-out">
  14 500Р
</div>

.cross-out {
  display: inline-block;
  position: relative;
  font-size: 24px;
}

.cross-out::after {
  display: block;
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-image: linear-gradient(to top left, transparent calc(50% - 1px), #000 50%, transparent calc(50% + 1px));
  pointer-events: none;
}