99-129.6÷x=69
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99-129.6÷x=6999-129.6÷x=6999-129.6÷x=69129.6÷x=99-69129.6÷x=3030x=129.6x=4.324.3299-69=30129.6/30=4.
99-129.6÷x=69
99-129.6÷x=69
99-129.6÷x=69
129.6÷x=99-69
129.6÷x=30
30x=129.6
x=4.32
4.32 99-69=30 129.6/30=4.32
129除以X=99-69 X=129除以30 X=4.3
129.6/X=99-69
X=129.6/(99-69)
X=（69-99）/（-129.6)
X=4.32
99-129.6÷x=69129.6÷x=99-69129.6÷x=3030x=129.6x=4.32
30x=129.6
x=4.32
-129.6÷x=69-99
-129.6÷x=-30
x=4.32
绝对正确
129.6÷x=99-69
129.6÷x=30
30x=129.6
x=4.32使左右两边相等
99-129.6÷x=69
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