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2×(8-X)+3×(X+2)=48,去括弧 16-2X+3X+6=48,移項 -2X+3X=48-16-6,合併 X=26 36-2X=18,移項 -2X=18-36,合併 -2X=-18,係數化1 X=-18÷(-2) X=9
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