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    20.7×a×0.66+3=12.38
    (a-20.9)÷a=0.2
    (a-16.9)÷a=0.2
    (a-13.9)÷a=0.2
    (a-9.9)÷a=0.2
    (a-6.9)÷a=0.2
    a-6.9÷a=0.2
    11.7×a×0.66+3=8.12
    11.7×0.9×a+3=8.12
    7.8×0.9×a+3=8.12
    (a-6.9)÷a=0.15
    x+x*0.25=180
    x*0.25+180=x
    180+x*0.25=x
    X^3-6x^2+12 x- 6+(4-x)^3-6(4-x)^2+12(4-x)-6
    X^3-6x^2+12 x- 6=0
    296x=306(x-1)
    25n^2-192n-144=0
    a×0.9=1
    1.6*(1+x)²=2.5

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