1/2(2r+9)-1/3(r+12)=1

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Solution for 1/2(2r+9)-1/3(r+12)=1 equation: 


r in (-oo:+oo)

(1/2)*(2*r+9)-((1/3)*(r+12)) = 1 // - 1

(1/2)*(2*r+9)-((1/3)*(r+12))-1 = 0

(1/2)*(2*r+9)+(-1/3)*(r+12)-1 = 0

1/2*(2*r+9)-1/3*(r+12)-1 = 0

1/2*(2*r+9)-1/3*(r+12)-1 = 0

2/3*r-1+1/2 = 0

2/3*r-1/2 = 0

2/3*r-1/2 = 0

2/3*r-1/2 = 0 // + 1/2

2/3*r = 1/2 // : 2/3

r = 1/2/2/3

r = 3/4

r = 3/4

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