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x in (-oo:+oo)
(2/3)*x+15 = 4 // - 4
(2/3)*x-4+15 = 0
2/3*x+11 = 0 // - 11
2/3*x = -11 // : 2/3
x = -11/2/3
x = -33/2
x = -33/2
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