15/4 -7x = 9 7x = 15/4 = 9 7x = 15-36 / 4 7x = -21/4 x = -21 / 4 * 1/7 = -3/4 因此x的答案= -3/4
15/4 -7x = 9
7x = 15/4 = 9
7x = 15-36 / 4
7x = -21/4
x = -21 / 4 * 1/7
= -3/4
因此x的答案= -3/4
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