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30 = (-5*x)/9 // - (-5*x)/9
30-((-5*x)/9) = 0
(5/9)*x+30 = 0
5/9*x+30 = 0 // - 30
5/9*x = -30 // : 5/9
x = -30/5/9
x = -54
x = -54
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