a: =>3x-2x=-3+2

=>x=-1

bL =>2u+27=4u+27

=>u=0

c: =>5-x+6=12-8x

=>-x+8x=12-6-5=1

=>7x=1

hay x=1/7

anh hoặc chị ơi ko có câu hỏi

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Mình đánh hơi lỗi xíu, yhoong cảm nha, cái giúo là giúp đó. Các bạn có đ/á nhanh thì mình k nha

yhoong cảm là thông cảm nha, hihi, mình xin lỗi vì mình đang gấp 

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