x²+2x+1=x²+6x+9
    x^3+3*x^2-9*x-15
    2/x
    42x-x=382-13
    4.5*8+x=91
    2.8x-14.4=x+14.4
    (1.7+4x)/1.5=6.6
    7.2-3x=2.46
    0.3x+4.5x=31.2
    55x+49x=520
    8.4x-2.8x=14
    (x-4.9)*5=21
    6.7+3x=8.2
    2.8x-14.4=x+14.4
    4x+(0.5+2)=2x+7.5
    0.3(2x+1.3)=6.3
    1.7x+13.4=18*1.5
    200+x=160*6
    (16-2x)/3=0.4
    7.2-3x=2.46

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