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3*x-(2*(x/5)) = 20 // - 20
3*x-(2*(x/5))-20 = 0
3*x+(-2/5)*x-20 = 0
13/5*x-20 = 0 // + 20
13/5*x = 20 // : 13/5
x = 20/13/5
x = 100/13
x = 100/13
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