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x in (-oo:+oo)
19 = (2/3)*x-15 // - (2/3)*x-15
15-((2/3)*x)+19 = 0
(-2/3)*x+15+19 = 0
34-2/3*x = 0 // - 34
-2/3*x = -34 // : -2/3
x = -34/(-2/3)
x = 51
x = 51
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