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(-4/9)*(2*x-4) = 40 // - 40
(-4/9)*(2*x-4)-40 = 0
-4/9*(2*x-4)-40 = 0
-4/9*(2*x-4)-40 = 0
-8/9*x-344/9 = 0
-8/9*x-344/9 = 0
-8/9*x-344/9 = 0 // + 344/9
-8/9*x = 344/9 // : -8/9
x = 344/9/(-8/9)
x = -43
x = -43
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