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x-((8/5)*x)-x+(9/7)*x+35+49 = 0
x+(-8/5)*x-x+(9/7)*x+35+49 = 0
84-11/35*x = 0 // - 84
-11/35*x = -84 // : -11/35
x = -84/(-11/35)
x = 2940/11
x = 2940/11
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