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18*x-((1/5)*x)-1 = 4 // - 4
18*x-((1/5)*x)-4-1 = 0
18*x+(-1/5)*x-4-1 = 0
89/5*x-5 = 0 // + 5
89/5*x = 5 // : 89/5
x = 5/89/5
x = 25/89
x = 25/89
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