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(1/14)*(x-4) = (2/7)*(x+6)-((1/7)*x) // - (2/7)*(x+6)-((1/7)*x)
(1/14)*(x-4)-((2/7)*(x+6))+(1/7)*x = 0
(1/14)*(x-4)+(-2/7)*(x+6)+(1/7)*x = 0
1/14*(x-4)-2/7*(x+6)+x/7 = 0
(1/14*7*(x-4))/7+(-2/7*7*(x+6))/7+x/7 = 0
1/14*7*(x-4)-2/7*7*(x+6)+x = 0
x-3/2*x-14 = 0
-1/2*x-14 = 0
(-1/2*x-14)/7 = 0
(-1/2*x-14)/7 = 0 // * 7
-1/2*x-14 = 0
-1/2*x-14 = 0 // + 14
-1/2*x = 14 // : -1/2
x = 14/(-1/2)
x = -28
x = -28
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