exam Maths Puzzle Numerical Ability

please help me solve the following equations:

[x-5]=15

3[x]-5=1

[x]+5=15

3[2x-5]-2=7

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exam Other Question

Solve the equation using the zero factor property.

2w(4w+1)=1 How do I work this problem?
Give the equation of the horizontal asymptote of the following rational function:

f(x)= x^2+x-6/x-4

Thank you.