Răspuns:
[tex]2^{31} + 2^{30} + {2}^{29} = x \times 28[/tex]
[tex] {2}^{3} \times {2}^{28} + {2}^{2} \times {2}^{28} + 2 \times {2}^{28} = x \times 28[/tex]
[tex] {2}^{28} \times ( {2}^{3} + {2}^{2} + 2) = x \times 28[/tex]
[tex] {2}^{28} \times (8 + 4 + 2) = x \times 28[/tex]
[tex] {2}^{28} \times 14 = x\times 28[/tex]
[tex] {2}^{28} = x \times 28 \div 14[/tex]
[tex] {2}^{28} = x \times 2[/tex]
[tex]x = {2}^{28} \div 2[/tex]
[tex]x = {2}^{27} [/tex]
