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12-(2*x) = 8-((2/5)*x) // - 8-((2/5)*x)
(2/5)*x-(2*x)-8+12 = 0
(2/5)*x-2*x-8+12 = 0
4-8/5*x = 0 // - 4
-8/5*x = -4 // : -8/5
x = -4/(-8/5)
x = 5/2
x = 5/2
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