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(1/4)*(16*x-20) = 1.5*(25*x-20) // - 1.5*(25*x-20)
(1/4)*(16*x-20)-(1.5*(25*x-20)) = 0
(1/4)*(16*x-20)-1.5*(25*x-20) = 0
1/4*(16*x-20)-1.5*(25*x-20) = 0
1/4*(16*x-20)-1.5*(25*x-20) = 0
25-33.5*x = 0
25-33.5*x = 0
25-33.5*x = 0 // - 25
-33.5*x = -25 // : -33.5
x = -25/(-33.5)
x = 0.74626866
x = 0.74626866
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