Answer :

[tex]46-17=46-\underbrace{(10+7)}_{=17}=\underbrace{46-10}_{=36}-7=36-7=36-\underbrace{(6+1)}_{=7}\\\\=\underbrace{36-6}_{30}-1=30-1=\boxed{\boxed{29}}[/tex]

Here is the answer, I hope this helps:

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