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