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x in (-oo:+oo)
30 = (2*x)/6 // - (2*x)/6
30-((2*x)/6) = 0
(-1/3)*x+30 = 0
30-1/3*x = 0 // - 30
-1/3*x = -30 // : -1/3
x = -30/(-1/3)
x = 90
x = 90
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