(+٢)+(+٥)= - +٧, (-٢)+(-٥)= - -٧, (+٦)+(-١)= - +٥, ( - ٧ ) + ( + ٤) = - - ٣, ٩ + ( -٧ ) + ( + ٧ )= - ٩, ا - ٨ ا - ٨,

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