x:9=C+R x=9C+R R-nr natural R={1,2,3,4,5,6,7,8} C-nr natural  C={2,3,4,5,6,7} 1)R=1 =>C=0   nu este solutie 2)R=2  =>C=1 x=9*1+2=9+2=11 3)R=3  =>C=2 x=9*2+3=18+3=21 4)R=4  =>C=3 x=9*3+4=27+4=31 5)R=5  =>C=4 x=9*4+5=36+5=41 6)R=6  =>C=5 x=9*5+6=45+6=51 7)R=7  =>C=6 x=9*6+7=54+7=61 8)R=8  =>C=7 x=9*7+8=63+8=71