Simplify: 3x + 7y - 2p + 7x - y
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You want to use the distributive property, i.e. the possibility to distribute a multiplication to both terms of an sum/subtraction.
In this case, if you think of 395 as of 400-5, you have
And you can use the distributive property to write
Both of these multiplications are easy to perform in your mind:
