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