exam Maths Puzzle Numerical Ability

how to solve a rational equation like this one 8/x+1/3=5/x

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exam Other Question

find three consecutive integers such that the sum of the first two is equeal to 3 more than the third

so i got x+(x+2)=3x+9 and simplified to get x=-7 but i don't know which dir find the logarithmic formula that gives the pH of a substance. State what each variable in your equation represents.

Find the pH of a substance of your choice that is alkaline (