13.2-X+9X=55.5怎么解

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13.2-X+9X=55.5怎么解
13.2-X+9X=55.5怎么解

13.2-X+9X=55.5怎么解
13.2-X+9X=55.5
8X=55.5-13.2
8X=42.3
X=5.2875

(9-1)X=55.5-13.2
8X=42.3
X=42.3/8
X=5.2875