(91+X)/(102+X)=0,9

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Solution for (91+X)/(102+X)=0,9 equation: 


D( X )

X+102 = 0

X+102 = 0

X+102 = 0

X+102 = 0 // - 102

X = -102

X in (-oo:-102) U (-102:+oo)

(X+91)/(X+102) = 0.9 // - 0.9

(X+91)/(X+102)-0.9 = 0

(X+91)/(X+102)+(-0.9*(X+102))/(X+102) = 0

X-0.9*(X+102)+91 = 0

0.1*X-0.8 = 0

(0.1*X-0.8)/(X+102) = 0

(0.1*X-0.8)/(X+102) = 0 // * X+102

0.1*X-0.8 = 0

0.1*X-0.8 = 0 // + 0.8

0.1*X = 0.8 // : 0.1

X = 0.8/0.1

X = 8

X = 8

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