book Maths Puzzle Numerical Ability

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

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book Other Question

I need to represent each quantity with a real number. Here is the problem:
A country exported $60,000,000 less than it imported creating a negative trade balance.
Garph Y=-2x+2 A= B= C=
Step1 X=-b/2a
Step 2 The Vertex is?
Table The Line of Symmetry is X=?
X