exam Maths Puzzle Numerical Ability

Can you help me find the answer for this equation :(x-3)(5x+1)

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exam Other Question

Add or subtract. Write the answer in lowest terms.

x
over
x-4

plus

8
over
x+4

minus

32
over
x^2-16
1/4(8y+4)-17=1/2(4y-8)