x-140-(1/4x-35)=2/5x這個方程怎麼解?

x-140-(1/4x-35)=2/5x這個方程怎麼解?

x-140-(1/4x-35)=2/5x
x-140-1/4x+35=2/5x
x-1/4x-2/5x=140-35
7/20x=105
x=105÷7/20
x=420