Question 209820
F/R=2/9,,,,,or  F=(2/9)R
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F=R-35,,,,,or  R=F+35
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subst,,,,,F= (2/9)(F+35) = 2/9F +(2/9)*35 
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(7/9)F = 70/9
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F=10,,,,,R=35+10 = 45
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check,,,,F/R = 10/45=2/9,,,ok
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10=45-35 =10,,,,ok
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