7X+3*1.4X=0.2*56
    3X/5=7.4
    3(X+0.5)=21
    5*(3-2X)=2.4*5
    3(X+0.5)=21
    1.4*8-2X=6
    15.6/4-3.5X=1.1
    3X+4(2.5-6)=2
    0.3/0.15+25X=12
    15.6/4-3.5X=1.1
    10X+45*8=810
    (X-140)/70=4
    9.8X-X=3.8
    0.1(X+6)=3.3*0.4
    (0.5+2)+X=9.8/2
    x-2/x
    5X+4=24
    5X-4*12=22.5
    4X-2.4*5=48
    4X-5*6=12

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