(90-z)/(90-70)=0.3

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Solution for (90-z)/(90-70)=0.3 equation: 


z in (-oo:+oo)

(90-z)/(90-70) = 0.3 // - 0.3

(90-z)/(90-70)-0.3 = 0

(90-z)/20-0.3 = 0

(90-z)/20+(-0.3*20)/20 = 0

90-z-0.3*20 = 0

84-z = 0

(84-z)/20 = 0

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

84-z = 0

84-z = 0 // - 84

-z = -84 // * -1

z = 84

z = 84

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