exam Maths Puzzle Numerical Ability

7x - 5 + 3x = 6 + x - 10

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exam Other Question

can someone check this for me PLEASE?
X^2
OVER
X-3
MINUS
9
OVER
X-3
X^2-9
OVER
X-3
EQUAL
9
OVER
X-3 Please help me with this question, I am not sure what strategy to use to find the answer. Thank you!!

Find two prime numbers that, if multiplied, would generate a 400-digit num