Question

Resolva 45= 15 - (m - 10)

Answer 1

45 = 15 - (m -10) 
15 - (m - 10) = 45
- m + 10 +15 = 45
- m + 25 = 45
- m = 20
m = - 20

Answer 2

45=15-(m-10)

45=15-m+10

45-15-10=-m

m=-20