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4 = 3/12-(5*x) // - 3/12-(5*x)
5*x-(3/12)+4 = 0
5*x-1/4+4 = 0
5*x+15/4 = 0 // - 15/4
5*x = -15/4 // : 5
x = -15/4/5
x = -3/4
x = -3/4
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