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5.6 = 3.8-(x/3) // - 3.8-(x/3)
x/3-3.8+5.6 = 0
1/3*x+1.8 = 0 // - 1.8
1/3*x = -1.8 // : 1/3
x = -1.8/1/3
x = -5.40000005
x = -5.40000005
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