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(3 * 12) - (4 * 10) = 36 - 40 = -40 + 36 = -(40 - 36) = -4

It may make it easier for you to do it this way:

Subtract the smaller number from the biggest (40 - 36 = 4)

Keep the sign of the bigger number (-4)

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14y ago

What else can I help you with?