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X-(9*x)+10+11 = 3*(1/3-2*x)+12*x // - 3*(1/3-2*x)+12*x
X-(3*(1/3-2*x))-(9*x)-(12*x)+10+11 = 0
X-3*(1/3-2*x)-9*x-12*x+10+11 = 0
X-3*(1/3-2*x)-9*x-12*x+10+11 = 0
X+6*x-9*x-12*x-1+10+11 = 0
X-3*x-12*x-1+10+11 = 0
X-15*x-1+10+11 = 0
X-15*x+9+11 = 0
X-15*x+20 = 0
X-15*x+20 = 0
X-15*x+20 = 0 // - X+20
-15*x = -(X+20) // : -15
x = (-(X+20))/(-15)
x = (X+20)/15
x = (X+20)/15
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