The result of -12+-4+3 will be -13. When you multiply a (+) and a (-) you will get a (-). Therefore, -12+-4+3 will be -12 - 4+3. Hence (-12-4) + 3 which will be -16 + 3 which will add up to -13. To help you out with this equation, you may want to use a number line so as to add up.