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(1/2)*x-(3*(x-5)) = 5*(x-9) // - 5*(x-9)
(1/2)*x-(3*(x-5))-(5*(x-9)) = 0
(1/2)*x-3*(x-5)-5*(x-9) = 0
x/2-3*(x-5)-5*(x-9) = 0
(-3*2*(x-5))/2+(-5*2*(x-9))/2+x/2 = 0
x-3*2*(x-5)-5*2*(x-9) = 0
x-16*x+120 = 0
120-15*x = 0
(120-15*x)/2 = 0
(120-15*x)/2 = 0 // * 2
120-15*x = 0
120-15*x = 0 // - 120
-15*x = -120 // : -15
x = -120/(-15)
x = 8
x = 8
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