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2*x-(3*x)+7/3-(5/7)-20 = 30-((3*x)/5) // - 30-((3*x)/5)
2*x-(3*x)+(3*x)/5+7/3-(5/7)-30-20 = 0
2*x-3*x+(3*x)/5+7/3-5/7-30-20 = 0
-2/5*x-1016/21 = 0 // + 1016/21
-2/5*x = 1016/21 // : -2/5
x = 1016/21/(-2/5)
x = -2540/21
x = -2540/21
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