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(X^1)/3-((15*x^1)/3) = -54 // + 54
(X^1)/3-((15*x^1)/3)+54 = 0
X/3-5*x+54 = 0
1/3*X-5*x+54 = 0 // - 1/3*X+54
-5*x = -(1/3*X+54) // : -5
x = (-(1/3*X+54))/(-5)
x = (1/3*X+54)/5
x = (1/3*X+54)/5
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