Răspuns :
x-170-302=181
x-170=483
x=483+170
x=653
....................................
555-x-111=94
555-x=205
-x=-350
x=350
x-170=483
x=483+170
x=653
....................................
555-x-111=94
555-x=205
-x=-350
x=350
X-170-302=181
X=181+170+302
X=351+302
X=653
555-X-111=94
X=94+555+111
X=649+111
X=760
X=181+170+302
X=351+302
X=653
555-X-111=94
X=94+555+111
X=649+111
X=760