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We could represent this in an Algebraic equation, where "x" is the missing number. If we write out the equation we will get:

x + (-12) = 19. We simply add 12 to both sides.

x + (-12) + 12 = 19 + 12.

x = 19 + 12

x = 31.

When 31 must be added to -12 to obtain 19.

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9y ago

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