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