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10*x-20 = (4/5)*x // - (4/5)*x
10*x-((4/5)*x)-20 = 0
10*x+(-4/5)*x-20 = 0
46/5*x-20 = 0 // + 20
46/5*x = 20 // : 46/5
x = 20/46/5
x = 50/23
x = 50/23
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