방정식 을 풀다.x÷5=1.4               3.4x-48=26.8             13(x+5)=169.

방정식 을 풀다.x÷5=1.4               3.4x-48=26.8             13(x+5)=169.

(1)x÷5=1.4      x÷5×5=1.4×5            x=7(2)3.4x-48=26.8  3.4x-48+48=26.8+48   3.4x÷3.4=74.8÷3.4           x=22(3)13(x+5)=169 13(x+5)÷13=169÷13           x+5=13         x+5-5=13-5             x=8