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4*x-x-(51/5) = x-x // - x-x
4*x-x-x+x-(51/5) = 0
4*x-x-x+x-51/5 = 0
3*x-51/5 = 0 // + 51/5
3*x = 51/5 // : 3
x = 51/5/3
x = 17/5
x = 17/5
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