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-6*x-5 = (5/7)*x+388/7 // - (5/7)*x+388/7
-6*x-((5/7)*x)-(388/7)-5 = 0
(-5/7)*x-6*x-388/7-5 = 0
-47/7*x-423/7 = 0 // + 423/7
-47/7*x = 423/7 // : -47/7
x = 423/7/(-47/7)
x = -9
x = -9
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