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x in (-oo:+oo)
10 = (2*x)/6 // - (2*x)/6
10-((2*x)/6) = 0
(-1/3)*x+10 = 0
10-1/3*x = 0 // - 10
-1/3*x = -10 // : -1/3
x = -10/(-1/3)
x = 30
x = 30
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