(100-x)/100=0.7

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Solution for (100-x)/100=0.7 equation: 


x in (-oo:+oo)

(100-x)/100 = 0.7 // - 0.7

(100-x)/100-0.7 = 0

(100-x)/100+(-0.7*100)/100 = 0

100-x-0.7*100 = 0

30-x = 0

(30-x)/100 = 0

(30-x)/100 = 0 // * 100

30-x = 0

30-x = 0 // - 30

-x = -30 // * -1

x = 30

x = 30

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