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(1/2)*(5*x+1) = 2*(1-(4*x))+9 // - 2*(1-(4*x))+9
(1/2)*(5*x+1)-(2*(1-(4*x)))-9 = 0
(1/2)*(5*x+1)-2*(1-4*x)-9 = 0
1/2*(5*x+1)-2*(1-4*x)-9 = 0
1/2*(5*x+1)-2*(1-4*x)-9 = 0
21/2*x-9-3/2 = 0
21/2*x-21/2 = 0
21/2*x-21/2 = 0
21/2*x-21/2 = 0 // + 21/2
21/2*x = 21/2 // : 21/2
x = 21/2/21/2
x = 1
x = 1
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