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x in (-oo:+oo)
10 = (2/3)*x // - (2/3)*x
10-((2/3)*x) = 0
(-2/3)*x+10 = 0
10-2/3*x = 0 // - 10
-2/3*x = -10 // : -2/3
x = -10/(-2/3)
x = 15
x = 15
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