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
    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

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