방정식 풀이.X÷0.4=0.12+0.7                          4X-0.7=7.3.

방정식 풀이.X÷0.4=0.12+0.7                          4X-0.7=7.3.

(1)x÷0.4=0.12+0.7,         x÷0.4=0.82,    x÷0.4×0.4=0.82×0.4,            &n...