exam Maths Puzzle Numerical Ability

HELP!
please explain to me and help w/ this problem::
x/2 + x/4 =5

and this:
25x/5 - 7x= 12

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exam Other Question

Please help me with this question.

Write a quadratic equation with the given roots. Write the equation in standard form.

-2, -5 Can someone please help me to answer this question showing the step-by-step process of how to find the answer? I appreciate the help. This did not come from a book so there is no