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0.8 litres water is how many cups? How many edges in a circle? Describe how and where new crust material is made. Describe how and where old crust is destroyed.? 7^(x+1) + 7^x + 7^(x-1) = 399, what is x? Problem involving math induction! If m and n are distinct real numbers, prove that (m+2)^2 = (n+2)^2 if and only if x+y=-4?