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(-2*x)/5 = 3-((4*x)/7)-8 // - 3-((4*x)/7)-8
(-2*x)/5+(4*x)/7-3+8 = 0
6/35*x+5 = 0 // - 5
6/35*x = -5 // : 6/35
x = -5/6/35
x = -175/6
x = -175/6
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