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X-(5*((1/2)*x-4)) = 5 // - 5
X-(5*((1/2)*x-4))-5 = 0
X-5*((1/2)*x-4)-5 = 0
X-5*(1/2*x-4)-5 = 0
X-5*(1/2*x-4)-5 = 0
X-5/2*x-5+20 = 0
X-5/2*x+15 = 0
X-5/2*x+15 = 0
X-5/2*x+15 = 0 // - X+15
-5/2*x = -(X+15) // : -5/2
x = (-(X+15))/(-5/2)
x = 2/5*(X+15)
x = 2/5*(X+15)
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