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\left(m-5\right)\left(m+3\right)=\left(m-2\right)\left(m+5\right)
Variable m cannot be equal to any of the values 2,5 since division by zero is not defined. Multiply both sides of the equation by \left(m-5\right)\left(m-2\right), the least common multiple of m-2,m-5.
m^{2}-2m-15=\left(m-2\right)\left(m+5\right)
Use the distributive property to multiply m-5 by m+3 and combine like terms.
m^{2}-2m-15=m^{2}+3m-10
Use the distributive property to multiply m-2 by m+5 and combine like terms.
m^{2}-2m-15-m^{2}=3m-10
Subtract m^{2} from both sides.
-2m-15=3m-10
Combine m^{2} and -m^{2} to get 0.
-2m-15-3m=-10
Subtract 3m from both sides.
-5m-15=-10
Combine -2m and -3m to get -5m.
-5m=-10+15
Add 15 to both sides.
-5m=5
Add -10 and 15 to get 5.
m=\frac{5}{-5}
Divide both sides by -5.
m=-1
Divide 5 by -5 to get -1.