①(2.7+3)x=57
②2.85+2.5x=15.35
③15.5-5x=5.5
x+1.25＝2.1 8.4x﹣1.9x＝1.3 4（x+0.2）＝4
x-13=25 2(x+6)=58 8x-5x=3.3
①2x-15=35 ②4(x+2.5)=22
