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2*x+12 = 4/5 // - 4/5
2*x-(4/5)+12 = 0
2*x-4/5+12 = 0
2*x+56/5 = 0 // - 56/5
2*x = -56/5 // : 2
x = -56/5/2
x = -28/5
x = -28/5
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