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(1/5)*(5*x-20) = 2*x-5 // - 2*x-5
(1/5)*(5*x-20)-(2*x)+5 = 0
(1/5)*(5*x-20)-2*x+5 = 0
1/5*(5*x-20)-2*x+5 = 0
1/5*(5*x-20)-2*x+5 = 0
5-x-4 = 0
1-x = 0
1-x = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x = 1
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