Simplify (-2a+5-b)*(-5)

$(- 2 a + 5 - b) \cdot (- 5)$

Apply the distributive property.

$- 2 a \cdot - 5 + 5 \cdot - 5 - b \cdot - 5$

Simplify.

Multiply $- 5$ by $- 2$ .

$10 a + 5 \cdot - 5 - b \cdot - 5$

Multiply $5$ by $- 5$ .

$10 a - 25 - b \cdot - 5$

Multiply $- 5$ by $- 1$ .

$10 a - 25 + 5 b$

$10 a - 25 + 5 b$

Move $- 25$ .

$10 a + 5 b - 25$

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