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Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

You are making a battery for a science project. you have copper wire for your first electrode. you need to choose a conductor, a second electrode, and a device to plug into your battery. you have already chosen a lemon conductor. complete each statement below about the options that include a lemon conductor.

How to solve a simultaneous equation involved with fractions?