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x in (-oo:+oo)
(2/3)*x+7 = -6 // + 6
(2/3)*x+6+7 = 0
2/3*x+13 = 0 // - 13
2/3*x = -13 // : 2/3
x = -13/2/3
x = -39/2
x = -39/2
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