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2-7.

Use the eTool below to solve the problem.
Click the link at right for the full version of the eTool: MC2 2-7 HW eTool

Hops to the right can be represented with a positive number, while hops to the left can be represented with a negative number.
Use this to write an expression.

−2 + 4 - 6 + 10 = 6