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4-((2/5)*x) = (2*x)/5-5 // - (2*x)/5-5
4-((2/5)*x)-((2*x)/5)+5 = 0
(-2/5)*x+(-2/5)*x+4+5 = 0
9-4/5*x = 0 // - 9
-4/5*x = -9 // : -4/5
x = -9/(-4/5)
x = 45/4
x = 45/4
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