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x in (-oo:+oo)
(1/2)*(x+10) = (1/3)*(x+9) // - (1/3)*(x+9)
(1/2)*(x+10)-((1/3)*(x+9)) = 0
(1/2)*(x+10)+(-1/3)*(x+9) = 0
1/2*(x+10)-1/3*(x+9) = 0
1/2*(x+10)-1/3*(x+9) = 0
1/6*x+2 = 0
1/6*x+2 = 0
1/6*x+2 = 0 // - 2
1/6*x = -2 // : 1/6
x = -2/1/6
x = -12
x = -12
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