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Compare the subtraction problems 6/8 - 5/8 = 1/8 and 6/9 - 7/9 = 1/9 why is the answer to the first problem positive and the answer to the second problem negative
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Find the solution of this system of equation -7x+y=-20 9x-3y=36
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2,-1,0,1 which pair numbers has a sum zero...
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