(80-z)/(80-70)=0.125

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Solution for (80-z)/(80-70)=0.125 equation: 


z in (-oo:+oo)

(80-z)/(80-70) = 0.125 // - 0.125

(80-z)/(80-70)-0.125 = 0

(80-z)/10-0.125 = 0

(80-z)/10+(-0.125*10)/10 = 0

80-z-0.125*10 = 0

78.75-z = 0

(78.75-z)/10 = 0

(78.75-z)/10 = 0 // * 10

78.75-z = 0

78.75-z = 0 // - 78.75

-z = -78.75 // * -1

z = 78.75

z = 78.75

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