X-12.5%X=(56-X)+12.5%X

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X-12.5%X=(56-X)+12.5%XX-12.5%X=(56-X)+12.5%XX-12.5%X=(56-X)+12.5%XX-12.5%X=(56-X)+12.5%X87.5%x=56-x+

X-12.5%X=(56-X)+12.5%X
X-12.5%X=(56-X)+12.5%X

X-12.5%X=(56-X)+12.5%X
X-12.5%X=(56-X)+12.5%X
87.5%x=56-x+12.5%x
87.5%x=56-87.5%x
87.5%x+87.5%x=56
175%x=56
x=32

等式左右两边同时乘以100,去掉百分号,然后去括号,合并同类项,求出x