1/6[20x+50]+2/3[5+2x]-1/2[4x+10]=0

问题描述:

1/6[20x+50]+2/3[5+2x]-1/2[4x+10]=0

1/6[20x+50]+2/3[5+2x]-1/2[4x+10]=0
两边同时乘以6
20x+50+4(5+2x)-3(4x+10)=0
20x+50+20+8x-12x-30=0
16x=-40
x=-2.5