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(1/5)*(5*x-15)-(2*x) = 0
(1/5)*(5*x-15)-2*x = 0
1/5*(5*x-15)-2*x = 0
1/5*(5*x-15)-2*x = 0
-x-3 = 0
-x-3 = 0
-x-3 = 0 // + 3
-x = 3 // * -1
x = -3
x = -3
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