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0,6x-0,504x+0,7056 = 19,8 - 3x
0,6x - 0,504x + 3x = 19,8 - 0,7056
3,096x = 19,0944
x = 19,0944 ÷ 3,096
x = 6,16744186
x = 6,17 (aproximado a los centecimos)