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