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1/3x-x=4
-2/3x=4 /:(-2/3)
x=4/1 * (-3/2) = -6
1/1 + 6/7x = 4/7
- 6/7x = 4/7 - 7/7
-6/7 = - 3/7
x= -3/7 * (-7/3)
x=1
1/3x-x=2+2
-2/3x=4/:(-2/3)
x=-6
1-6/7x=4/7
6/7x=4/7-1
6/7x=-3/7 /:6/7
x=1/2