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math

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1. x-3

7x-3x = 4 x -6 turns into +6 so 4x=12 x=3

2. 13=5-13+3x 13=-8 +3x 21 = 3x x=7
3. x+x+x+3x+2-6 = 31 6x -4 = 31 6x=35 = 5.83 (are you sure its 3 x's?)

5. 5-t-t=-1 5-2t=-1 -2t = -6 t= 3

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