Final answer:
Option A, '6x+12=70-8', is the most likely equation that could be used to solve for x in a parallelogram, presuming it's representing the relationship between equal sides or angles in the parallelogram.
Step-by-step explanation:
The student's question involves solving for x in the context of a parallelogram. One must assume there’s a given diagram accompanying the question that shows the lengths and angles of the parallelogram, although it’s not present in the text provided.
Without the diagram, the choice must rely on knowledge of properties of parallelograms. In a parallelogram, opposite sides are equal and opposite angles are equal.
Given this, we can rule out options that don't match these properties. Choices B and C cannot be correct because they involve summing or equating angles or sides, which should not equal 90 or 180 unless it is a rectangle or four right angles are involved, which is not the general case for parallelograms. Option D doesn't seem to solve for x.
Therefore, by process of elimination and assuming typical parallelogram properties apply, option A is the most likely equation that could be used to solve for x, as it might represent the equality of two sides or two angles.