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x/13-((7*x)/12) = 2/3 // - 2/3
x/13-((7*x)/12)-(2/3) = 0
x/13+(-7/12)*x-2/3 = 0
-79/156*x-2/3 = 0 // + 2/3
-79/156*x = 2/3 // : -79/156
x = 2/3/(-79/156)
x = -104/79
x = -104/79
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