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7*x-(3*x)+1/5 = 221/5 // - 221/5
7*x-(3*x)+1/5-(221/5) = 0
7*x-3*x+1/5-221/5 = 0
4*x-44 = 0 // + 44
4*x = 44 // : 4
x = 44/4
x = 11
x = 11
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