5.
a)45 000-15 345=29.655
b)33 786+3218=37.004
c)118 654 -23 467=95.187
7.a+22 832=45 400-654
a+22 832=44.746
a=44.746-22 832
a=21.914
32 574+b=52 432-9 345
32 574+b=43.087
b=43.087-32 574
b=10.513
