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(8*(6-x))/7 = -x // + x
(8*(6-x))/7+x = 0
(8*(6-x))/7+(7*x)/7 = 0
8*(6-x)+7*x = 0
48-x = 0
(48-x)/7 = 0
(48-x)/7 = 0 // * 7
48-x = 0
48-x = 0 // - 48
-x = -48 // * -1
x = 48
x = 48
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