(80-z)/(80-70)=0.375

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Solution for (80-z)/(80-70)=0.375 equation: 


z in (-oo:+oo)

(80-z)/(80-70) = 0.375 // - 0.375

(80-z)/(80-70)-0.375 = 0

(80-z)/10-0.375 = 0

(80-z)/10+(-0.375*10)/10 = 0

80-z-0.375*10 = 0

76.25-z = 0

(76.25-z)/10 = 0

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

76.25-z = 0

76.25-z = 0 // - 76.25

-z = -76.25 // * -1

z = 76.25

z = 76.25

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