(X+30)x6+(24-X)x6=2[(30+X)x6-6]

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(X+30)x6+(24-X)x6=2[(30+X)x6-6](X+30)x6+(24-X)x6=2[(30+X)x6-6](X+30)x6+(24-X)x6=2[(30+X)x6-6]左边提取公因式

(X+30)x6+(24-X)x6=2[(30+X)x6-6]
(X+30)x6+(24-X)x6=2[(30+X)x6-6]

(X+30)x6+(24-X)x6=2[(30+X)x6-6]
左边提取公因式变为6*(x+30+24-x)=6*54
右边提取公因式变为12*(30+x-1)=12*(x+29
)
左边等于右边得 27=x+29
解得x=-2