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(1/3)*(x+5) = k // - k
(1/3)*(x+5)-k = 0
1/3*(x+5)-k = 0
1/3*(x+5)-k = 0
1/3*x-k+5/3 = 0
1/3*x-k+5/3 = 0
1/3*x-k+5/3 = 0 // - 5/3-k
1/3*x = -(5/3-k) // : 1/3
x = (-(5/3-k))/1/3
x = 3*(k-5/3)
x = 3*(k-5/3)
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