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1/3-((10/49)*x) = 16/49-((1/21)*x) // - 16/49-((1/21)*x)
(1/21)*x-((10/49)*x)+1/3-(16/49) = 0
(-10/49)*x+(1/21)*x+1/3-16/49 = 0
1/147-23/147*x = 0 // - 1/147
-23/147*x = -1/147 // : -23/147
x = -1/147/(-23/147)
x = 1/23
x = 1/23
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