x-4=(81+78+x+84+93)÷5怎么解?

x-4=(x+336)/5
5*(x-4)=x+336
5x-20=x+336
4x=356
x=89

x-4=(81+78+x+84+93)÷5

5(x-4)=(81+78+x+84+93)

5x-20=81+78+x+84+93

5x-x=81+78+84+93+20

4x=356

x=89

x - 4 = ( 81 78 x 84 93 ) ÷ 5x - 4 = ( 336 x ) ÷ 5x - 4 = 336 ÷ 5 x ÷ 55x - 20 = 336 x4x = 356x = 89

5(x-4)=x+336

5x-20=x+336

4x=356

x=89

两边同乘以5得 5（x-4)=336+x
即 5x-20=336+x
移项得 4x=356
x=89

5(X-4)=336+X
4X-20=336
X=89