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3.8X+15=8.3X-12 移項,15+12=8.3x-3.8x 27=4.5x x=27/4.5=6
15.8X+12.8=3X 3X-15.8X=12.8 -12.8X=12.8 X=-1 可以根據和等於加數加加數這個關係來解這道題
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