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3(x-五分之二)=12原方程 3x-6/5=12把等號左邊3乘進括弧裏 15x-6=12*5等號左右同時乘以5去掉分母 15x=60+6把-6移動到等號右邊 15x=66計算出來 x=22/5答案
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