(X-258)-(1980-X+258)=24

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(X-258)-(1980-X+258)=24(X-258)-(1980-X+258)=24(X-258)-(1980-X+258)=24(X-258)-(1980-X+258)=24x-258-19

(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

(X-258)-(1980-X+258)=24 32x+258=x x+147=258 x= x= x+76=（258+x）×0.35 x x X x x x x x x x x |x| X x