-51-(-60)

Let's evaluate: -51 -(-60)
ⓘ Subtract a negative number by adding its opposite: the two minus signs become a plus: -(-60) = 60
-51 + 60
ⓘ Start from -51 and move forward 60 on the number line, going past zero: -51 + 60 = 9
▶Result:   9

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