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(1/2)*(5*x+8) = 4*x-5 // - 4*x-5
(1/2)*(5*x+8)-(4*x)+5 = 0
(1/2)*(5*x+8)-4*x+5 = 0
1/2*(5*x+8)-4*x+5 = 0
1/2*(5*x+8)-4*x+5 = 0
4-3/2*x+5 = 0
9-3/2*x = 0
9-3/2*x = 0
9-3/2*x = 0 // - 9
-3/2*x = -9 // : -3/2
x = -9/(-3/2)
x = 6
x = 6
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