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12-((4/5)*(5*x-10)) = 0
(-4/5)*(5*x-10)+12 = 0
12-4/5*(5*x-10) = 0
12-4/5*(5*x-10) = 0
20-4*x = 0
20-4*x = 0
20-4*x = 0 // - 20
-4*x = -20 // : -4
x = -20/(-4)
x = 5
x = 5
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