(D-3)*2/5=30

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Solution for (D-3)*2/5=30 equation: 


D in (-oo:+oo)

(2*(D-3))/5 = 30 // - 30

(2*(D-3))/5-30 = 0

(2*(D-3))/5+(-30*5)/5 = 0

2*(D-3)-30*5 = 0

2*D-156 = 0

(2*D-156)/5 = 0

(2*D-156)/5 = 0 // * 5

2*D-156 = 0

2*D-156 = 0 // + 156

2*D = 156 // : 2

D = 156/2

D = 78

D = 78

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