X-0.4X=36

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X-0.4X=36X-0.4X=36X-0.4X=36X-0.4X=360.6X=36X=60即0.6X=36X-0.4X=360.6X=36X=36/0.6X=60

X-0.4X=36
X-0.4X=36

X-0.4X=36
X-0.4X=36
0.6X=36
X=60

即0.6X=36

X-0.4X=36
0.6X=36
X=36/0.6
X=60