Explanation:
x / 2.5 = 2.5 / 2 | multiply both sides by 2 to get rid of one fraction
2×(x/2.5) = 2×(2.5/2)
2x/2.5 = 2.5 | multiply both sides by 2.5 to get rid of the other fraction
2.5×(2x/2.5) = 2.5 × 2.5
2x = 6.25
x = 6.25/2 = 3.125
3.125 cm / 2.5 cm = 2.5 cm / 2 cm