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x in (-oo:+oo)
1-3*x = (1/3)*x+13/3 // - (1/3)*x+13/3
1-3*x-((1/3)*x)-(13/3) = 0
(-1/3)*x-3*x-13/3+1 = 0
-10/3*x-10/3 = 0 // + 10/3
-10/3*x = 10/3 // : -10/3
x = 10/3/(-10/3)
x = -1
x = -1
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