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(5/7)*x-x-8 = -52/7 // + -52/7
(5/7)*x-x-(-52/7)-8 = 0
(5/7)*x-x+52/7-8 = 0
-2/7*x-4/7 = 0 // + 4/7
-2/7*x = 4/7 // : -2/7
x = 4/7/(-2/7)
x = -2
x = -2
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