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3.2 = (4/5)*(x-5) // - (4/5)*(x-5)
3.2-((4/5)*(x-5)) = 0
(-4/5)*(x-5)+3.2 = 0
3.2-4/5*(x-5) = 0
3.2-4/5*(x-5) = 0
7.2-4/5*x = 0
7.2-4/5*x = 0
7.2-4/5*x = 0 // - 7.2
-4/5*x = -7.2 // : -4/5
x = -7.2/(-4/5)
x = 9
x = 9
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