Find - 3 (2.5-k) + 0.5 (7+8k)

First, distribute the parentheses:

(-3 * 2.5) + (-3 * - k) + (.5 * 7) + (.5 * 8k)

-7.5 + 3k + 3.5 + 4k

Combine like terms:

(-7.5 + 3.5) + (3k + 4k)

-4 + 7k

I don't see an equal sign so it's not an equation, just an algebraic expression, which means that the answer is - 4 + 7k

The solution to the problem is: x = (-2, - 3)