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(1/3)*x = (5/6)*X-15 // - (5/6)*X-15
(1/3)*x-((5/6)*X)+15 = 0
(-5/6)*X+(1/3)*x+15 = 0
1/3*x-5/6*X+15 = 0 // - 15-5/6*X
1/3*x = -(15-5/6*X) // : 1/3
x = (-(15-5/6*X))/1/3
x = -3*(15-5/6*X)
x = -3*(15-5/6*X)
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