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Question #14967

1 Answer

Aug 31, 2016

$- 2 a + 7 = 7 - 2 a$ $-2a+7 = 7-2a$

Explanation:

Addition has a property known as commutativity, meaning that for any $x$ $x$ and $y$ $y$ , we have $x + y = y + x$ $x+y = y+x$ .

In this case, if we let $x = - 2 a$ $x = -2a$ and $y = 7$ $y=7$ , that property directly shows that the two given expressions are equal:

$(- 2 a) + 7 = 7 + (- 2 a) = 7 - 2 a$ $(-2a) + 7 = 7 + (-2a) = 7-2a$

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