(90-z)/(90-80)=0.6

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Solution for (90-z)/(90-80)=0.6 equation: 


z in (-oo:+oo)

(90-z)/(90-80) = 0.6 // - 0.6

(90-z)/(90-80)-0.6 = 0

(90-z)/10-0.6 = 0

(90-z)/10+(-0.6*10)/10 = 0

90-z-0.6*10 = 0

84-z = 0

(84-z)/10 = 0

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

84-z = 0

84-z = 0 // - 84

-z = -84 // * -1

z = 84

z = 84

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