7 X / 2 - (- 5 X / 2) =20X / 3 + 10
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7x/2+5x/2=20x/3+10
7x+5x/2=200x+3/30
12x/2=200x+3/30
6x=200x+3/30
6x×30=200x+3
180x=200x+3
180x-200x=3
-20x=3
x=-3/20
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