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-4*x-(5/8) = (3/7)*x-1167/280 // - (3/7)*x-1167/280
-4*x-((3/7)*x)-(5/8)-(-1167/280) = 0
(-3/7)*x-4*x-5/8+1167/280 = 0
124/35-31/7*x = 0 // - 124/35
-31/7*x = -124/35 // : -31/7
x = -124/35/(-31/7)
x = 4/5
x = 4/5
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