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Equation for the synthesis of N-(2-chloroethyl piperidine)? How can you solve the problem of health care providers who don't have a working phone number, or don't return calls? Need to find the solutions to |2(x-1)| + y = 1 and x + 2|y-1| = 8 ? Is there proof the earth is round? X elevado a +3 presenta 72 electrones, cual es el numero atomico?