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(1/5)*(10*x-15) = 5*x-9 // - 5*x-9
(1/5)*(10*x-15)-(5*x)+9 = 0
(1/5)*(10*x-15)-5*x+9 = 0
1/5*(10*x-15)-5*x+9 = 0
1/5*(10*x-15)-5*x+9 = 0
9-3*x-3 = 0
6-3*x = 0
6-3*x = 0
6-3*x = 0 // - 6
-3*x = -6 // : -3
x = -6/(-3)
x = 2
x = 2
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