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4*(x-1)+4/9 = 7*x-x+311/100+1 // - 7*x-x+311/100+1
4*(x-1)+x-(7*x)+4/9-(311/100)-1 = 0
4*(x-1)+x-7*x+4/9-311/100-1 = 0
(4*9*100*(x-1))/(9*100)+(9*100*x)/(9*100)+(-7*9*100*x)/(9*100)+(4*100)/(9*100)+(-311*9)/(9*100)+(-1*9*100)/(9*100) = 0
4*9*100*(x-1)+9*100*x-7*9*100*x+4*100-311*9-1*9*100 = 0
4500*x-6300*x-3600-2799-900+400 = 0
400-1800*x-3600-2799-900 = 0
-1800*x-3200-2799-900 = 0
-1800*x-5999-900 = 0
-1800*x-6899 = 0
(-1800*x-6899)/(9*100) = 0
(-1800*x-6899)/(9*100) = 0 // * 9*100
-1800*x-6899 = 0
-1800*x-6899 = 0 // + 6899
-1800*x = 6899 // : -1800
x = 6899/(-1800)
x = -6899/1800
x = -6899/1800
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