Final answer to the problem
$\frac{21}{10}$
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Step-by-step Solution
Specify the solving method
1
Subtract the values $3.4$ and $-1.3$
$2.1-2.8d+2.8d$
2
Cancel like terms $-2.8d$ and $2.8d$
$\frac{21}{10}$
Final answer to the problem
$\frac{21}{10}$