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5*x-18 = 4-1/5 // - 4-1/5
5*x-(-1/5)-18-4 = 0
5*x+1/5-18-4 = 0
5*x-109/5 = 0 // + 109/5
5*x = 109/5 // : 5
x = 109/5/5
x = 109/25
x = 109/25
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