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x in (-oo:+oo)
(1/3)*(x-1) = 4 // - 4
(1/3)*(x-1)-4 = 0
1/3*(x-1)-4 = 0
1/3*(x-1)-4 = 0
1/3*x-13/3 = 0
1/3*x-13/3 = 0
1/3*x-13/3 = 0 // + 13/3
1/3*x = 13/3 // : 1/3
x = 13/3/1/3
x = 13
x = 13
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