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(1/8)*(x-5) = (1/9)*(x-4) // - (1/9)*(x-4)
(1/8)*(x-5)-((1/9)*(x-4)) = 0
(1/8)*(x-5)+(-1/9)*(x-4) = 0
1/8*(x-5)-1/9*(x-4) = 0
1/8*(x-5)-1/9*(x-4) = 0
1/72*x-13/72 = 0
1/72*x-13/72 = 0
1/72*x-13/72 = 0 // + 13/72
1/72*x = 13/72 // : 1/72
x = 13/72/1/72
x = 13
x = 13
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