4x-3（20-x）+4=04x-60+3x+4=04x+3x=60-47x=56x=56÷7x=8
4x-3（20-x）+4=0 4x-60+3x+4=0 7x=56 x=8
4x-3（20-x）+4=0 4x-60+3x+4=07x=56x=8
