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(3/7)*(4/3-((7*x)/5))-((2/7)*(-((9*x)/7)-4/3)) = 0
(3/7)*((-7/5)*x+4/3)+(-2/7)*((-9/7)*x-4/3) = 0
3/7*(4/3-7/5*x)-2/7*(-9/7*x-4/3) = 0
3/7*(4/3-7/5*x)-2/7*(-9/7*x-4/3) = 0
20/21-57/245*x = 0
20/21-57/245*x = 0
20/21-57/245*x = 0 // - 20/21
-57/245*x = -20/21 // : -57/245
x = -20/21/(-57/245)
x = 700/171
x = 700/171
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