(X-80)*0.67/4200=(X-160)*0.67.X等于多少?请写出计算过程?(X-80)*0.67/4200=(X-160)*0.67/4000.X等于多少?请写出计算过程?

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(X-80)*0.67/4200=(X-160)*0.67.X等于多少?请写出计算过程?(X-80)*0.67/4200=(X-160)*0.67/4000.X等于多少?请写出计算过程?
(X-80)*0.67/4200=(X-160)*0.67.X等于多少?请写出计算过程?
(X-80)*0.67/4200=(X-160)*0.67/4000.X等于多少?请写出计算过程?

(X-80)*0.67/4200=(X-160)*0.67.X等于多少?请写出计算过程?(X-80)*0.67/4200=(X-160)*0.67/4000.X等于多少?请写出计算过程?
(X-80)*0.67/4200=(X-160)*0.67/4000,等号两边同时除以0.67,再同时乘以200,得:(X-80)/21=(X-160)/20,即:(X-80)×20=(X-160)×21,即20X-80×20=21X-21×160,即X=21×160-20×80=1760.