$$R=13-[35-((10+8)+(25-17))]$$
$R=4$
$$R=13-\left(35-\left(18+25-17\right)\right)$$
$$R=13-\left(35-\left(43-17\right)\right)$$
$$R=13-\left(35-26\right)$$
$$R=13-9$$
$$R=4$$
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$R≔4$
