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Elisabeth's ideas

Problem

Simplify 5x 5y
header 1header 2header 3
data 1data 2data 3
data 4data 5data 6
data 7data 8data 9
x+5=30x+55=305x=25
a(b+c)=ab+ac
f(x)={7if x=1f(x1)+5ifx>1
f(x)={7if x=1f(x1)+5if x>1
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