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-x+2x=-3
x=-3
3 x + 1/7 = x - 1
3x-x=-1-1/7
2x=-1 1/7
2x=-8/7
x=-8/14
x=-4/7
-x-2x=3
-3x=3/:(-3)
x=-1
3x=1/7=x-1
3x-x=-1-1/7
2x=-1i1/7/:2x
2x=-8/7/:2
x=-4/7