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r2 + r - 20 = 0
(r + 5)(r - 4) = 0
r + 5 = 0 or r - 4 = 0
r = -5 or r = 4

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r2 + r - 20 = 0
(r + 5)(r - 4) = 0
r + 5 = 0 or r - 4 = 0
r = -5 or r = 4

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r9 - 6 = 12

then r is 2

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x = (r + st)/r is the expression that represents x in the equation rx - st = r.

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Since r varies directly with s, we have

r = ks (replace k with 5 and s with 7)

r = (5)(7)

r = 35

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To solve for r, you can multiply both sides of the equation by 7 to isolate r. This gives you r = 1400 * 7, which simplifies to r = 9800.

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