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OpenStudy (anonymous):
solve by the elimination method 5r -7s = -5 and 7r +5s = 67
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OpenStudy (anonymous):
5(5r-7s)=5(-5) 7(7r+5s)=7(67) -------------- 74r=444 ---> r=6 5(6)-7s=-5 ----> s=5
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