Question

300 + ______ = -415

??

Answer 1

$300 + x = - 415 \\ x = - 415 - 300 \\ x = - 715$

Therefore,

300 + -715 = -415

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Answer 2

Answer:

-715

Step-by-step explanation:

Let the blank number be x,

300 + (x) = -415

x = -415- 300

x = -715