Question 1119756
isabel is 13 years older than marie. in 5 years, isabel age will be 10 less than twice mai's age. how old is each now? 
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I = M + 13
In 5 years:
I = 2M - 10
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Sub for I
M + 13 = 2M - 10
M = 23 (in 5 years)
etc