(54 - x) * 3.1 = 12.4 * 2

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(54 - x) * 3.1 = 12.4 * 2

(54 - x) * 3.1 = 12.4 * 2
(54 - x) * 3.1 = 12.4 * 2

(54 - x) * 3.1 = 12.4 * 2
54-x=12.4*2/3.1
54-x=4*2
x=54-8
x=46

(54 - x) ×3.1 = 12.4×2
两边同除以3.1:54-x=4×2
54-x=8
因为减数=被减数-差
所以, x=54-8
x=46.