What would the answer be for this equation 7x/20 - 5x/12

Two lines parallel to a third line are parallel to each other. always sometimes or never

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.

Which geometric principle is used to justify the construction below?