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x in (-oo:+oo)
10*x = (1/3)*(6*x-30) // - (1/3)*(6*x-30)
10*x-((1/3)*(6*x-30)) = 0
(-1/3)*(6*x-30)+10*x = 0
10*x-1/3*(6*x-30) = 0
10*x-1/3*(6*x-30) = 0
8*x+10 = 0
8*x+10 = 0
8*x+10 = 0 // - 10
8*x = -10 // : 8
x = -10/8
x = -5/4
x = -5/4
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