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4*x-(32*(8*x-(7/8))) = 28 // - 28
4*x-(32*(8*x-(7/8)))-28 = 0
4*x-32*(8*x-7/8)-28 = 0
4*x-32*(8*x-7/8)-28 = 0
28-252*x-28 = 0
-252*x = 0
-252*x = 0
-252*x = 0 // : -252
x = 0
x = 0
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