Question

Find x: (7x – 5) – 4(2 + 5x) = 10(2 – x)

Answer 1

Expanding the brackets,

7x – 5 – 4 × 2 – 4 × 5x = 10 × 2 + 10 × (– x)

7x – 5 – 8 – 20x = 20 – 10x

7x – 13 – 20x = 20 – 10x

Transposing 10x and – 13, we get

7x – 13 – 20x + 10x = 20

7x – 20x + 10x = 20 + 13 ......(Simplifying)

7x – 10x = 33

– 3x = 33

3x = – 33

x = `(-33)/3` = – 11

x = – 11