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6*x+3/21+5 = (7/21)*(4*x-2) // - (7/21)*(4*x-2)
6*x-((7/21)*(4*x-2))+3/21+5 = 0
(-1/3)*(4*x-2)+6*x+3/21+5 = 0
6*x-1/3*(4*x-2)+1/7+5 = 0
(-1/3*7*(4*x-2))/7+(6*7*x)/7+1/7+(5*7)/7 = 0
6*7*x-1/3*7*(4*x-2)+5*7+1 = 0
98/3*x+1+14/3+35 = 0
98/3*x+17/3+35 = 0
98/3*x+122/3 = 0
(98/3*x+122/3)/7 = 0
(98/3*x+122/3)/7 = 0 // * 7
98/3*x+122/3 = 0
98/3*x+122/3 = 0 // - 122/3
98/3*x = -122/3 // : 98/3
x = -122/3/98/3
x = -61/49
x = -61/49
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