x/12+x-2/10=1解：（1/12+1）x=1+2/1013/12x=12/10x=12/10÷13/12x=12/10×12/13x=72/65
x/12+x-2/10=1x/12+12x/12=1+2/1013x/12=12/10x=12/10x12/13x=144/130x=72/65
