Q: What is 1 plus 1 minus 2 plus 3 plus 4 minus 7?

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3 + 3 - 7 + 2 - 1 + 109 = 109

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(10+9)+(1−1)+(2−2)+(3−1)+(4−4) = 21This is the same equation rewritten: (10+9)+(3−1) = 21This can be done as 1-1, 2-2, 4-4 cancel themselves out.

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3 + 3 - 7 + 2 - 1 + 109 = 109

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Negative plus a negative is a negative. Ex. -1+-1=-2 Negative times a negative is a positive. -2*-2=4 But a negative [minus] plus a positive [plus] can be minus, zero or plus: For example, -3 + 2 = -1 -3 + 3 = 0 -3 + 4 = +1

(10+9)+(1−1)+(2−2)+(3−1)+(4−4) = 21This is the same equation rewritten: (10+9)+(3−1) = 21This can be done as 1-1, 2-2, 4-4 cancel themselves out.

minus 6, plus 3, minus 6, plus 3...

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9A:2 - 1 - 1 + 1 - 1 + 3 - 2 + 6 = 7The answer is seven.

When you are using non-standard definitions of "plus" and "minus", or of "equal".

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