Question

(9x9-6x6-a)+913+28/4)=53

Answer 1

45-a+913=46
45-a=-867
-a=-912 inmultesti cu (-1)
a=912

Answer 2

(9*9-6*6-a)+913+28/4=15=
=(81-36-a)+913+7=15=
=(45-a)+920=15=
45-a=920-15
45-a=915
a=915-45
a=870
(9*9-6*6-870)+913+28/4=15