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8-(2*x) = 52/7 // - 52/7
8-(2*x)-(52/7) = 0
8-2*x-52/7 = 0
4/7-2*x = 0 // - 4/7
-2*x = -4/7 // : -2
x = -4/7/(-2)
x = 2/7
x = 2/7
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