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x in (-oo:+oo)
(2/3)*x+6 = 5 // - 5
(2/3)*x-5+6 = 0
2/3*x+1 = 0 // - 1
2/3*x = -1 // : 2/3
x = -1/2/3
x = -3/2
x = -3/2
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