Add and subtract signed numbers and explain the meaning of the sign changes.
Find a missing signed value in an equation
Problem
Find the missing signed number: \(x~+~(-7)~=~-2\).
Big Picture
What this problem is really about
Solve by undoing the negative seven that is added to x. Add its opposite to both sides so the opposite pair cancels on the variable side while equality stays balanced. After evaluating the other side, substitute the result into the original equation to confirm that it reaches negative two exactly.
Inside Gozunta
Turn the preview into practice.
More than a preview
Gozunta lets you study this problem—and more than 10,000 others.
Create targeted learning sessions, use hints, check your answer, read the walkthrough, watch the video, print the work, and track your progress.
