Answer:c = ab/a+bStep-by-step explanation:Let's solve for c.1/a + 1/b = 1/cStep 1: Multiply both sides by ab.a + b = ab/cStep 2: Multiply both sides by c.ac + bc = abStep 3: Factor out variable c.c(a + b) = abStep 4: Divide both sides by a+b.c(a+b)/a+b = ab/a+b...

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