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4-(5*x) = (3*x)/5 // - (3*x)/5
4-(5*x)-((3*x)/5) = 0
(-3/5)*x-5*x+4 = 0
4-28/5*x = 0 // - 4
-28/5*x = -4 // : -28/5
x = -4/(-28/5)
x = 5/7
x = 5/7
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