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1/3

Step-by-step explanation:

1. A fraction is a part of a whole number. A fraction includes a numerator and denominator, where the numerator is equal to the number of parts being counted (or in this case, shaded), and the denominator is equal to the number of the total parts.

2. Given the information above, there's 1 part of the circle that's shaded, and 3 pieces in total. That means that numerator is 1 and denominator is 3, so written as a fraction, the answer is 1/3.

-2x + 7 = 7

subtract 7 from both sides.

-2x = 0

divide both sides by -2.

x = 0