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x in (-oo:+oo)
(2/3)*(x-6)+15 = 9 // - 9
(2/3)*(x-6)-9+15 = 0
2/3*(x-6)-9+15 = 0
2/3*(x-6)-9+15 = 0
2/3*x-13+15 = 0
2/3*x+2 = 0
2/3*x+2 = 0
2/3*x+2 = 0 // - 2
2/3*x = -2 // : 2/3
x = -2/2/3
x = -3
x = -3
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