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Adding can be thought of as going right on the number line.
1.7
Commutative Property of Addition
a+(- b)=a-b
Subtract term
Below we will demonstrate by finding - 7.2 and moving 8.9 units to the right on the number line.
The resulting position, after moving to the right on the number line, is the sum. - 7.2+8.9=1.7