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10*x-(66/5) = 4*x // - 4*x
10*x-(4*x)-(66/5) = 0
10*x-4*x-66/5 = 0
6*x-66/5 = 0 // + 66/5
6*x = 66/5 // : 6
x = 66/5/6
x = 11/5
x = 11/5
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