求一道初中上学期数学方程题讲解:1/5(x+15)=1/2-1/3(x-7)去分母,得 6(x+15)=15-10(x-7)去括号得 6x+90 =15-10x+70移向合并同类项得16x=-5方程两边同时除以16得x=-5/16请问:为什么去分母得6(x+1

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