exam Maths Puzzle Numerical Ability

How come the variable sometimes is next to more then one number when there is more then one variable i get confused

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exam Other Question

24. Find b^2 – 4ac and the number of real solutions for the given equation.
–x^2 + 12x – 32 = 0
Find all real solutions to the equation.
the sqare root of x+4 minus 2 time the sqare root of x-1 = -1