9.7x-3(2.1x+3)=5.34-2.1*(7.4-2x)解:9.7x-6.3x-9=5.34-15.54+4.2x3.4x-9=4.2x-10.24.2x-3.4x=10.2-90.8x=1.2x=1.5
9.7x-3(2.1x+3)=5.34-2.1(7.4-2x),9.7x-6.3x-9=5.34-15.54+4.2x,4.2x+6.3x-9.7x=15.54-9-5.34,0.8x=1.2,x=1.5