(21+(x*70/100))/100=0.6

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Solution for (21+(x*70/100))/100=0.6 equation: 


x in (-oo:+oo)

((70*x)/100+21)/100 = 0.6 // - 0.6

((70*x)/100+21)/100-0.6 = 0

(7/10*x+21)/100-0.6 = 0

(7/10*x+21)/100+(-0.6*100)/100 = 0

7/10*x-0.6*100+21 = 0

7/10*x-39 = 0

(7/10*x-39)/100 = 0

(7/10*x-39)/100 = 0 // * 100

7/10*x-39 = 0

7/10*x-39 = 0 // + 39

7/10*x = 39 // : 7/10

x = 39/7/10

x = 390/7

x = 390/7

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