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How do you make a the subject of r equals ab divided by a plus b?
Wiki User
∙ 12y ago
Are you asking to have that equation solved for 'a' ?
r = ab / (a + b)
Multiply each side by (a + b) . . . ra + rb = ab
Subtract 'ra' from each side. . . . rb = ab - ra
Factor the right side . . . . . . . . . rb = a (b - r)
Divide each side by (b - r) . . . . . a = rb / (b - r)
Wiki User
∙ 12y ago
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