1,21=(1+x/100)(1+y/100)

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Solution for 1,21=(1+x/100)(1+y/100) equation: 


x in (-oo:+oo)

1.21 = (x/100+1)*(y/100+1) // - (x/100+1)*(y/100+1)

1.21-((x/100+1)*(y/100+1)) = 0

1.21-1*(1/100*x+1)*(1/100*y+1) = 0

1.21-1*(1/100*x+1)*(1/100*y+1) = 0

0.21-1/100*x-1/10000*x*y-1/100*y = 0

0.21-1/100*x-1/10000*x*y-1/100*y = 0

0.21-1/100*x-1/100*y = 0 // - 0.21-1/100*y

-1/100*x = -(0.21-1/100*y) // : -1/100

x = (-(0.21-1/100*y))/(-1/100)

x = 100*(0.21-1/100*y)

x = 100*(0.21-1/100*y)

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