20-9X=1.2*6.25
    35*1+45X=60X
    9.2X+1.5X=32.1
    9.2X+1.5X=32-1
    22X-18X=10.8
    2X-1.8X=18
    2X-18X=10.8
    2.8X+3.6=20
    6.7X+2.3=10.8
    13/X=0.4
    X/25=4
    28-X=12
    2.8X+3.6=20
    7.2-3X=2.46
    X+1.8=3.6
    X+(2X+16)=91
    7.2-3X=2.46
    (10-7.5)X=1
    2.8X+3.6=20
    20-9X=1.2*6.25

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