>>> 2(x-3) + 3(x-4) = 7x-10                                  >>> x-1/2 + x-2/3 = 4-x/4
>>> 4(x-3) = -20                                   >>> 3x-1/5 = x-1/3 + 7x-4/15
>>> X + 3/3 = 2x-1/7                                   >>> x+2/2 - x/6 = 5
>>> 4(2x-1) = 2(x-1)                                   >>> 5(x-2) = 2(x+1)
>>> 7x-3 = 4x+21                                   >>> 3(x+1) = -12
>>> 3x/4 - x/12 = 6