Answer
Add 3.3 to each side.
Work Step by Step
To solve an inequality, you need to isolate the variable on one side of the inequality.
$a-3.3\geq2.6\longrightarrow$ add 3.3 to each side
$a-3.3+3.3\geq2.6+3.3\longrightarrow$ add
$a\geq5.9$
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