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