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X/10 = 4-((2*x)/5) // - 4-((2*x)/5)
X/10+(2*x)/5-4 = 0
1/10*X+2/5*x-4 = 0 // - 1/10*X-4
2/5*x = -(1/10*X-4) // : 2/5
x = (-(1/10*X-4))/2/5
x = 5/2*(4-(1/10*X))
x = 5/2*(4-(1/10*X))
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