Answer
$x = 4.7$
Work Step by Step
$x - 2.8 = 1.9$
$x - 2.8 + 2.8 = 1.9 + 2.8$
$x = 4.7$
Check:
$4.7 - 2.8 = 1.9$
$1.9 = 1.9$
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