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1) a. 3x + 5x= 8x
b. 9a - 6a +3b= 3a c. p + q - p - q + 1= 1 d. 9x - 6x= 3x e. 2x + 3y - 5x= 3y - 3x f. 8x - 2x + 5x= 11x

2) A die is thrown once. Find the probability that it is:
- a six= 1/6 - an even number= 1/2 - a number greater than 4= 1/3 - a prime number= 1/2 - a seven= 0 - a square number= 1/3