Odpowiedź:
[tex]1. \: x + 75 = 95 \\ x = 95 - 75 \\ x = 20[/tex]
[tex]2. \: x \div 15 = 3 \\ x = 3 \times 15 \\ x = 45[/tex]
[tex]3. \: 2x = 30 \\ x = 30 \div 2 \\ x = 15[/tex]
[tex]4. \: x - 50 = 5 \\ x = 5 + 50 \\ x = 55[/tex]
[tex]5. \: 3x + 4 = 28 \\ 3x = 28 - 4 \\ 3x = 24 \\ x = 24 \div 3 \\ x = 8[/tex]
[tex]6. \: x \div 7 = 11 \\ x = 11 \times 7 \\ x = 77 [/tex]
[tex]7. \: 2x = x + 15 \\ 2x - x = 15 \\ x = 15[/tex]
[tex]8. \: x \div 6 - 10 = 50 \\ x \div 6 = 50 + 10 \\ x \div 6 = 60 \\ x = 60 \times 6 \\ x = 360 [/tex]
[tex]9. \: 5x = x - 12 \\ 5x - x = - 12 \\ 4x = - 12 \\ x = - 12 \div 4 \\ x = - 3[/tex]
[tex]10. \: 99 = x \times 11 \\ 11x = 99 \\ x = 99 \div 11 \\ x = 9[/tex]
