(X-258)-(1980-X+258)=24
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![(X-258)-(1980-X+258)=24](/uploads/image/z/8910997-61-7.jpg?t=%28X-258%29-%281980-X%2B258%29%3D24)
(X-258)-(1980-X+258)=24
(X-258)-(1980-X+258)=24
(X-258)-(1980-X+258)=24
(X-258)-(1980-X+258)=24
x-258-1980+x-258=24
2x=258+258+1980+24
2x=2520
x=1260
(X-258)-(1980-X+258)=24
x-258-1980+X-258=24
2x=2520
x=1260
X=1260
详
(X-258)-(1980-X+258)=24
→X-258-1980+X-258=24
→2X-2496=24
→2X=2496+24
→2X=2520
→X=2520/2
→X=1260