(12+x)/2=15

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Solution for (12+x)/2=15 equation: 


x in (-oo:+oo)

(x+12)/2 = 15 // - 15

(x+12)/2-15 = 0

(x+12)/2+(-15*2)/2 = 0

x-15*2+12 = 0

x-18 = 0

(x-18)/2 = 0

(x-18)/2 = 0 // * 2

x-18 = 0

x-18 = 0 // + 18

x = 18

x = 18

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