2. Simple Equations Brackets

3. Consider the simple equation 5(2x+3) = 3(x+9) Remove the brackets to obtain 10x + 15 = 3x + 27 Subtract 15 from both sides 10x + 15 - 15 = 3x + 27 – 15 Simplify 10x = 3x + 12 Subtract 3x from both sides 10x – 3x = 3x + 12 – 3x Simplify 7x = 12 Divide both sides by 7 Solution x = 1.71

4. Example 2:- Consider the simple equation 7(3x-1) = 4(2x+3) Remove the brackets to obtain 21x - 7 = 8x + 12 Add 7 to both sides 21x - 7 + 7 = 8x + 12 + 7 Simplify 21x = 8x + 19 Subtract 8x from both sides 21x – 8x = 8x + 19 – 8x Simplify 13x = 19 Divide both sides by 13 Solution x = 1.46

5. Examples to try 1. 5(2x+3) = 3(x+9) 2. 7(3x+4) = 5(2x+7) 3. 4(3x-7) = 3(x+4) 4. 6(5x-3) = 5(2x+5) 5. 8(5x-6) = 3(x+1) 6. 9(3x-5) = 5(2x+1) 7. 2(x-8) = 5(7-x) 8. 5(2x-3) = 3(5-3x) 9. 8(x-6) = 3(2-x) 10. 4(2x+5) = 5(1-x)