5.8x-3.3x=20
    3x-1.5x=1.2
    5(x+1.5)=17.5
    5(x+1.5)/5=17.5/5
    2x+2.8*2=10.4
    2(5x-16)=8
    2(5x-16)/2=8/4
    13.2x+9x=33.3
    (x-5)/0.2=0.75
    4(90-6x)=6.5*4+22
    (5x-25)*6=90
    4(3-x)=4.8
    1-lnx/2lnx
    2.6x-6.5+3.5=10
    20.9-x=2.5*8
    0.8*(7.2+x)=7.92
    5*x*x-8x-2.2
    2*(4.5+x)=13
    1.25*4-0.25x=0.9
    4x-2.7*4=60

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