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2/9-7*x = 3*x-178/9 // - 3*x-178/9
2/9-7*x-(3*x)-(-178/9) = 0
2/9-7*x-3*x+178/9 = 0
20-10*x = 0 // - 20
-10*x = -20 // : -10
x = -20/(-10)
x = 2
x = 2
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