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(9*x+4)/5-8 = 5.4 // - 5.4
(9*x+4)/5-8-5.4 = 0
(9*x+4)/5+(-8*5)/5+(-5.4*5)/5 = 0
9*x-8*5-5.4*5+4 = 0
9*x-36-27 = 0
9*x-63 = 0
(9*x-63)/5 = 0
(9*x-63)/5 = 0 // * 5
9*x-63 = 0
9*x-63 = 0 // + 63
9*x = 63 // : 9
x = 63/9
x = 7
x = 7
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