10x - 5y + 2x - 3y = 12x - 8y
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True
Same mathematical signs equal plus Different mathematical signs equal minus Plus Plus = Plus (+)(+) = + Minus Minus = Plus (-)(-) = + Plus Minus = Minus (+)(-) = - Minus Plus = Minus (-)(+) = - So the direct answer to your question would be: plus minus equals minus
zero
13+13+13+13+13+13+13+13+13+13 = 13 * 10 = 130.
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