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40-((2/5)*x) = (2/5)*x // - (2/5)*x
40-((2/5)*x)-((2/5)*x) = 0
(-2/5)*x+(-2/5)*x+40 = 0
40-4/5*x = 0 // - 40
-4/5*x = -40 // : -4/5
x = -40/(-4/5)
x = 50
x = 50
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