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Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.
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After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?
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What are the solutions for the following system? -2x^2+y=-5 y=-3x^2+5
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If i add 9 to my number, i get six what is my number?...
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