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Solve the following equations:

1. 7x – 5 = 2x 

2. 5x – 12 = 2x – 6 

3. 7p- 3 = 3p + 8 

4. 8m + 9 = 7m + 8 

5. 7z + 13 = 2z + 4 

1 Answer

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1. 7x – 5 = 2x 

⇒ 7x – 2x = 5

 ⇒ 5x = 5 

⇒ x = \(\frac55\) = 1 

∴ x = 1

2. 5x – 12 = 2x – 6

 ⇒ 5x – 2x = – 6 + 12

⇒ 3x = 6 

⇒ x = \(\frac63\) = 2 

∴ x = 2

3. 7p – 3 = 3p + 8 

⇒ 7p – 3p = 8 + 3 

⇒ 4p = 11 

⇒ p = \(\frac{11}4\)

4. 8m + 9 = 7m + 8 

⇒ 8m – 7m = 8 – 9 

∴ m = – 1

5. 7z + 13 = 2z + 4

⇒ 7z – 2z = 4 – 13 

⇒ 5z = – 9 

∴ z = \(\frac{-9}5\)

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