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1/2-((7/8)*x)-(3*x) = 0
(-7/8)*x-3*x+1/2 = 0
1/2-31/8*x = 0 // - 1/2
-31/8*x = -1/2 // : -31/8
x = -1/2/(-31/8)
x = 4/31
x = 4/31
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