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18*x+23 = 5/21 // - 5/21
18*x-(5/21)+23 = 0
18*x-5/21+23 = 0
18*x+478/21 = 0 // - 478/21
18*x = -478/21 // : 18
x = -478/21/18
x = -239/189
x = -239/189
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