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(1/2)*x-((2/3)*p)+12 = 0
(-2/3)*p+(1/2)*x+12 = 0
1/2*x-2/3*p+12 = 0 // - 12-2/3*p
1/2*x = -(12-2/3*p) // : 1/2
x = (-(12-2/3*p))/1/2
x = -2*(12-2/3*p)
x = -2*(12-2/3*p)
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