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2e - 12 = 7e + 8Add 12 to both sides: 2e = 7e + 20 subtract 7e from both sides: -5e = 20 divide both sides by -5: e = -4
5e-5 or 5 x 10^-5
7e-4 or 7 x 10^-4
3e+7e = 10e
7 x 10^-18 or 7E-18