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  1. or download this
    solve([2*x*(-5*10*x)=100],[x])
  2. or download this
    [x = - %I, x = %I]
  3. or download this
    integrate(sin(x)*exp(x^2),x);
  4. or download this
    solve([2*x^2+14*y+y^2=5,x*y+14*x+x^2=0],[x,y])