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19. An equation for this would be 8n = 216. Divide each side by 8 to isolate the “n”. 216/8 is 27. 27 * 8 is 216. There. The number is 27. n = 27.
20. An equation for this would be -7n = 1.477. Divide each side by -7 to isolate the “n”. 1.477/-7 is -0.211. -0.211 * -7 is 1.477. There. The number is -0.211. x = -0.211.
21. An equation for this would be 1/3n = 8.5. This time, we don’t divide. Because it’s a fraction, we multiply. Multiply each side by 3 to isolate the “n”. 8.5 * 3 is 25.5. 25.5 * 1/3 is 8.5. There. The number is 25.5. n = 25.5.
22. An equation would be 4/3n = 4.82. Again, we multiply, because it’s a fraction. With this, we multiply by the reciprocal, which is the opposite, in this case, 3/4. We do this to isolate the variable. 4.82 * 3/4 (0.75) is 3.615. 3.615 (3 123/200) * 4/3 is 4.82. There. The number is 3.615. x = 3.615.