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10 = (4/5)*x // - (4/5)*x
10-((4/5)*x) = 0
(-4/5)*x+10 = 0
10-4/5*x = 0 // - 10
-4/5*x = -10 // : -4/5
x = -10/(-4/5)
x = 25/2
x = 25/2
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