K/-9 + 6 = -4 how to solve/or answer?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42

You are living in aldine, tx and you are planning a trip to six flags in arlington, tx. you look on a map that has a scale of 0.5 inches to 30 miles. if the map shows the scale distance from aldine to arlington is 4 inches, how far is the actual distance?