1/R = 1/R1 + 1/R2 Solve for R1
R1R2 = RR2 + R1R
R1R2 = RR2 + R1R-R1R
R1R2 -R1R = R2R
R1(R2-R)/(R2-R) = R2R/(R2-R)
R1 = R2R/(R2-R)
1/R = 1/R1 + 1/R2 Solve for R1
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