(1+40%)x * 0.8=x+270

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(1+40%)x * 0.8=x+270
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(1+40%)x * 0.8=x+270
(1+40%)x * 0.8=x+270

(1+40%)x * 0.8=x+270
(1+40%)x * 0.8=x+270
1.4x * 0.8=x+270
1.12x=x+270
0.12x=270
x=2250

(1+40%)x * 0.8=x+270
1.4×0.8x-x=270
0.12x=270
x=270÷0.12
x=2250

原式:
(1+0.4)x * 0.8 = x + 270
1.12x=x+270
0.12x=270
x=2250

先左边算出x前的系数,后进行移项,1.12x=x+270,0.12x=270,x=2250