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X/5-12 = 9-(x/3) // - 9-(x/3)
X/5+x/3-12-9 = 0
1/5*X+1/3*x-21 = 0 // - 1/5*X-21
1/3*x = -(1/5*X-21) // : 1/3
x = (-(1/5*X-21))/1/3
x = 3*(21-(1/5*X))
x = 3*(21-(1/5*X))
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