book Maths Puzzle Numerical Ability

If y = 39 and y = -x/4 + 15, what is the value of X?

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please spmeone help me im so confused the problem it

y+6=15
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5
My teacher has our advanced algebra class taking college algebra tests just for the heck of it.
The problem asks to find a polynomial equation of degree 4 with integral coefficients that has solutions 1+i, 3, 0.