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(-5/9)*x-((1/8)*x)-(7/9) = 0
(-5/9)*x+(-1/8)*x-7/9 = 0
-49/72*x-7/9 = 0 // + 7/9
-49/72*x = 7/9 // : -49/72
x = 7/9/(-49/72)
x = -8/7
x = -8/7
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