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2*x+5*x+1/3+2/3 = 12*x-4 // - 12*x-4
2*x+5*x-(12*x)+1/3+2/3+4 = 0
2*x+5*x-12*x+1/3+2/3+4 = 0
5-5*x = 0 // - 5
-5*x = -5 // : -5
x = -5/(-5)
x = 1
x = 1
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