(90-z)/(90-70)=0.6

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Solution for (90-z)/(90-70)=0.6 equation: 


z in (-oo:+oo)

(90-z)/(90-70) = 0.6 // - 0.6

(90-z)/(90-70)-0.6 = 0

(90-z)/20-0.6 = 0

(90-z)/20+(-0.6*20)/20 = 0

90-z-0.6*20 = 0

78-z = 0

(78-z)/20 = 0

(78-z)/20 = 0 // * 20

78-z = 0

78-z = 0 // - 78

-z = -78 // * -1

z = 78

z = 78

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