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1)0.1x+0.2=0.3x+0.4
2)0.4x-0.7=0.2x+0.3
3)1/4x+1/2=1/5x+3/5
4)2/3x+4/5=1/6x+3/10
5)2/5x-5/6=3/10x+4/7