2 × (5x - 4) = 7 × (2x - 3)
2 × 5x - 2 × 4 = 7 × 2x - 7 × 3
10x - 8 = 14x - 21
-8 = 4x - 21
4x = -8 + 21
4x = 21 - 8
4x = 13
x = 13/4
