53+447+38=500+38=538
626+64+57=690+57=747
(73+87)+123=160+123=283
37+(167+53)=37+220=257
13+68+28+17=81+45=126
14+15+16+17=29+33=62
57+23+54+56=80+110=190
6576-445-999=6131-999=5132
7435+2242-798=7435+1444=8879
7676-(534+76)=7676-610=7066
(6789-578)-897=6211-897=5314
3000-(2456-457)=3000-1999=1001
5666-(3133+867)=6566-4000=2566