Đáp án:
Giải thích các bước giải: x-2+3x=x+2-3x
X-x+3x+3x=2+2
6x=4
X=4/6
2/3
Giải thích các bước giải: x-2+3x-x-2+3x=0
hay 6x-4=0
khi do x=2/3
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