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(4/5)*(25*x-15) = 50*(x+38) // - 50*(x+38)
(4/5)*(25*x-15)-(50*(x+38)) = 0
(4/5)*(25*x-15)-50*(x+38) = 0
4/5*(25*x-15)-50*(x+38) = 0
4/5*(25*x-15)-50*(x+38) = 0
-30*x-1912 = 0
-30*x-1912 = 0
-30*x-1912 = 0 // + 1912
-30*x = 1912 // : -30
x = 1912/(-30)
x = -956/15
x = -956/15
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