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2*x-(4*x)+(3*x)/13-(7/9)+21/15 = 2*x-(6/45) // - 2*x-(6/45)
2*x-(4*x)+(3*x)/13-(2*x)-(7/9)+21/15+6/45 = 0
2*x-4*x+(3*x)/13-2*x-7/9+21/15+6/45 = 0
34/45-49/13*x = 0 // - 34/45
-49/13*x = -34/45 // : -49/13
x = -34/45/(-49/13)
x = 442/2205
x = 442/2205
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