(X-5)除以80%=X+70

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(X-5)除以80%=X+70(X-5)除以80%=X+70(X-5)除以80%=X+70(X-5)÷80%=X+70X-5=80%(X+70)X-5=0.8(X+70)X-5=0.8X+56X-0.

(X-5)除以80%=X+70
(X-5)除以80%=X+70

(X-5)除以80%=X+70
(X-5) ÷80%=X+70
X-5=80%(X+70)
X-5=0.8(X+70)
X-5=0.8X+56
X-0.8X=56+5
0.2X=61
X=305

x=305

(X-5)÷80%=X+70
(X-5)×5/4=X+70
5X-25=4X+280
5X-4X=280+25
X=305

305