metamath/valid/mathd-algebra-110.mm

$(
  @{
    mathd-algebra-110.0 @e |- ( ph -> Q = ( 2 - ( 2 x. _i ) ) ) $@
    mathd-algebra-110.1 @e |- ( ph -> E = ( 5 + ( 5 x. _i ) ) ) $@
    @( (Contributed by Kunhao Zheng, 4-May-2021.) @)
    mathd-algebra-110 @p |- ( ph -> ( Q x. E ) = ; 2 0 ) @=
      ? @.
  @}
$)