(10+20+x)/3=45

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Solution for (10+20+x)/3=45 equation: 


x in (-oo:+oo)

(x+10+20)/3 = 45 // - 45

(x+10+20)/3-45 = 0

(x+30)/3-45 = 0

(x+30)/3+(-45*3)/3 = 0

x-45*3+30 = 0

x-105 = 0

(x-105)/3 = 0

(x-105)/3 = 0 // * 3

x-105 = 0

x-105 = 0 // + 105

x = 105

x = 105

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