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(2/3)*x-6 = (7/9)*x // - (7/9)*x
(2/3)*x-((7/9)*x)-6 = 0
(2/3)*x+(-7/9)*x-6 = 0
-1/9*x-6 = 0 // + 6
-1/9*x = 6 // : -1/9
x = 6/(-1/9)
x = -54
x = -54
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