问题
填空题
在等式5x-8=7的两边都（ ）得到等式5x=15，其依据是（ ）。
答案
加上8；等式性质l
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在等式5x-8=7的两边都（ ）得到等式5x=15，其依据是（ ）。
加上8；等式性质l
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