x+15=(x+21)/2

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Solution for x+15=(x+21)/2 equation: 


x in (-oo:+oo)

x+15 = (x+21)/2 // - (x+21)/2

x-((x+21)/2)+15 = 0

(-1*(x+21))/2+x+15 = 0

(-1*(x+21))/2+(2*x)/2+(2*15)/2 = 0

2*x-1*(x+21)+2*15 = 0

x-21+30 = 0

x+9 = 0

(x+9)/2 = 0

(x+9)/2 = 0 // * 2

x+9 = 0

x+9 = 0 // - 9

x = -9

x = -9

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