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(8*(x-9))/5 = -4*x // + -4*x
(8*(x-9))/5-(-4*x) = 0
(8*(x-9))/5+4*x = 0
(8*(x-9))/5+(4*5*x)/5 = 0
8*(x-9)+4*5*x = 0
28*x-72 = 0
(28*x-72)/5 = 0
(28*x-72)/5 = 0 // * 5
28*x-72 = 0
28*x-72 = 0 // + 72
28*x = 72 // : 28
x = 72/28
x = 18/7
x = 18/7
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