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x in (-oo:+oo)
(1/2)*x = 2/3-15 // - 2/3-15
(1/2)*x-(2/3)+15 = 0
(1/2)*x-2/3+15 = 0
1/2*x+43/3 = 0 // - 43/3
1/2*x = -43/3 // : 1/2
x = -43/3/1/2
x = -86/3
x = -86/3
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