（x+16）*2.1=42 x-0.6x=4.888 16*5-5x=26.5 98.6-0.25x=46.3 x-2.8+2.2=5 4.5-1.5x=1.5 8*（2x-5）=28

（x+16）*2.1=42 x+16=20x=4x-0.6x=4.888 0.4x=4.888x=12.2216*5-5x=26.5 5x=80-26.55x=53.5x=10.798.6-0.25x=46.3 0.25x=98.6-46.30.25x=52.3x=209.2x-2.8+2.2=5 x-0.6=5x=5.64.5-1.5x=1.5 1.5x=4.5-1.51.5x=3x=28*...