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x in (-oo:+oo)
(-1/3)*x+10 = 3*x+130/11 // - 3*x+130/11
(-1/3)*x-(3*x)-(130/11)+10 = 0
(-1/3)*x-3*x-130/11+10 = 0
-10/3*x-20/11 = 0 // + 20/11
-10/3*x = 20/11 // : -10/3
x = 20/11/(-10/3)
x = -6/11
x = -6/11
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