2120c

x-3/8x-5/12x=480-1805/24x=300x=1440123.20x+30*2x+70*(47-3x)=212020x+60x+3290-210x=21203290-120x=2120x=9124.3X/5 +10= 10/7125.2x+5=9126.10x-5(15-x)=60x=9127.8x=6*40/60+8x=3/2128.20-X=5 X=15129.7(2x-1)-3(4x-1)=4(3x+2)-1解14x-7-12x+3=12x+8-114...