exam Maths Puzzle Numerical Ability

Please help me solve: log base 5 (7+x) + log base 5 (8-x) - log base 5 2 = 2

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exam Other Question

adding fractions. write each result in simplest form.
(9/14)+(10/21)= perform the following conversions using unit factoring.
1. 500mL= L
2. 25cg= g
3. 400mg= kg