Răspuns :
[(a-1070)+2050]-729=7749
(a-1070)+2050=7749+729
(a-1070)+2050=8478
a-1070=8478-2050
a-1070=6428
a=6428+1070
a=7498
(a-1070)+2050=7749+729
(a-1070)+2050=8478
a-1070=8478-2050
a-1070=6428
a=6428+1070
a=7498