①3x+5＝17
②3x+0.2×6＝3.6
③3（16.2﹣x）＝19.2
④6x+1.5×0.7＝1.41
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
