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