방정식 을 풀다.×8=20.6                             x-(521+37)=23.

방정식 을 풀다.×8=20.6                             x-(521+37)=23.

(1)7x+0.7×8=20.6       7x+5.6-5.6=20.6-5.6            7x÷7=15÷7                x=217;(2)x-(521+37)=23            x-23=23         x-23+23=23+23              x=113.