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    4-8x-12=21-30x
    2300(1+x)^2=3200
    2300(1+x)2=3200
    40x-x²=140
    40x-x²=300
    (1.9-1.8)/(1.9-1.86)=(1.0403-x)/(1.403-1.0042)
    (1.9-1.8)/(1.9-1.86)=(1.0403-x)/(1.403-1.0042)
    ((1+X)^(30) -1) /X =100
    x^2-x^3=0.04
    (X-20)(-10x-1540)=0
    -x²+90x-1800=200
    (7-x)/(13+x)=1/3
    (51-x)/(39-x)=4
    x^2-3360x-1820^2=0
    x^2-672x-560*560=0
    2/x+x/2=1
    55x=45(x+6)
    (15+x)/(29+x)=3/5
    2x+40+x=310
    40x-x²=20

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