0
Anonymous
0 - 7 = -7
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There is a formula for "the difference of squares." (x + 7)(x - 7) = 0 x = 7, -7
4*7*5+7^2-3*0+15 = 140+49-0+15 = 204
(-7) - 5 - 2 = -14
13-6=7
-5 - (-5) = 0