Answer :

iGreen
[tex]\sf~W+2.1=5.4[/tex]

Subtract 2.1 to both sides:

[tex]\sf~W=3.3[/tex]
This is one-step equation.
[tex]W+2.1=5.4 \\ W+2.1-2.1=5.4-2.1 \\ W=3.3 \\ CHECK- \\ 3.3+2.1=5.4[/tex]

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