(456 + 112) - x = 400 x = x - (203 + 303) = 34 x = (283 - x) - 33 = 0 x = 382 - (x + 42) = 111 x = (536 + x) - 420 = 116 x = 437 - (227 + x) = 0 x = 468 - 217 - x = 51 x =
(456+112)-170=400; 540-(203+303)=34; (283-250)=33; 382-(229+42); (536+0)-420=116; 437-(227+210)=0; 468-217-200=51.