2x-3/5 + x-3/4 =4x-1/7
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2x-3/5+x-3/4=4x-1/7
2x+x-3/5-3/4=4x-1/7
3x-(12+15)/20=4x-1/7
4x-3x=-27/20+1/7
x=-167/140
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