a) (-6-1)-(-8+17) = -7 -25 = 32 b ) |-4-3|+ |-8+7| = |-7|+ |15 | = 7+15 = 22 a) |x+7 | = 4 x = -3 b) x-5 mai mare sau egal cu- 7 x= -2 ,-1, 0 ,1,2,,3,4,5,6,7,8,9 ........