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4 = (10-x)/(6-4) // - (10-x)/(6-4)
4-((10-x)/(6-4)) = 0
(-1*(10-x))/2+4 = 0
(-1*(10-x))/2+(2*4)/2 = 0
2*4-1*(10-x) = 0
x-2 = 0
(x-2)/2 = 0
(x-2)/2 = 0 // * 2
x-2 = 0
x-2 = 0 // + 2
x = 2
x = 2
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