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3*x+6 = 18/5 // - 18/5
3*x-(18/5)+6 = 0
3*x-18/5+6 = 0
3*x+12/5 = 0 // - 12/5
3*x = -12/5 // : 3
x = -12/5/3
x = -4/5
x = -4/5
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