20-9x=1.2*6.25
    35*1+45x=60x
    sinx=lnx
    sinx=e^x
    sinx=x^2
    15x+2=9x+20
    sinx=x/7.8
    sinx=x/7.7
    sinx=x/7.6
    sinx=x/7.5
    sinx=x/7
    9.2x+1.5x=32.1
    sinx=x/8
    sinx=x/6
    sinx=x/4
    sinx=x/3
    20/5x=80
    0.8*65+0.8*x+18=102
    45*2+45x=60x
    22x-18x=10.8

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