请帮我解一个方程 写出每一步 2[100x+10(x+1)+2x]-49=200x+10(x+1)+x
问题描述:
请帮我解一个方程 写出每一步 2[100x+10(x+1)+2x]-49=200x+10(x+1)+x
答
200x+20(x+1)+4x-49=200x+10x+10+x
200x+20x+20+4x-49=211x+10
224x-29-211x-10=0
13x=39
x=3