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(1/5)*(3-x) = (3/4)*(x-3) // - (3/4)*(x-3)
(1/5)*(3-x)-((3/4)*(x-3)) = 0
(1/5)*(3-x)+(-3/4)*(x-3) = 0
1/5*(3-x)-3/4*(x-3) = 0
1/5*(3-x)-3/4*(x-3) = 0
57/20-19/20*x = 0
57/20-19/20*x = 0
57/20-19/20*x = 0 // - 57/20
-19/20*x = -57/20 // : -19/20
x = -57/20/(-19/20)
x = 3
x = 3
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