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3/7-((3*x)/7)-x+4 = x+8 // - x+8
3/7-((3*x)/7)-x-x-8+4 = 0
(-3/7)*x-x-x+3/7-8+4 = 0
-17/7*x-25/7 = 0 // + 25/7
-17/7*x = 25/7 // : -17/7
x = 25/7/(-17/7)
x = -25/17
x = -25/17
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