SOLUTION: 7k+ar=-6y+r solve for r
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7k+ar=-6y+r solve for r
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7k +ar = -6y +r,,,,,subt (ar) and adding(6y) to both sides
7k + 6y = r - ar,,,,,,factor
7k+6y = r(1-a),,,,,,divide by (1-a)
(7k+6y) / (1-a) = r