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2*x-((3/8)*x)-(5/(-7)) = 0
2*x+(-3/8)*x+5/7 = 0
13/8*x+5/7 = 0 // - 5/7
13/8*x = -5/7 // : 13/8
x = -5/7/13/8
x = -40/91
x = -40/91
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