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(5/8)*(x-4) = (7/8)*(x+4) // - (7/8)*(x+4)
(5/8)*(x-4)-((7/8)*(x+4)) = 0
(5/8)*(x-4)+(-7/8)*(x+4) = 0
5/8*(x-4)-7/8*(x+4) = 0
5/8*(x-4)-7/8*(x+4) = 0
-1/4*x-6 = 0
-1/4*x-6 = 0
-1/4*x-6 = 0 // + 6
-1/4*x = 6 // : -1/4
x = 6/(-1/4)
x = -24
x = -24
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