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\left(m+2\right)\left(m+6\right)-m=m^{2}+8m+16
Variable m cannot be equal to any of the values -2,0 since division by zero is not defined. Multiply both sides of the equation by m\left(m+2\right), the least common multiple of m,m+2,m^{2}+2m.
m^{2}+8m+12-m=m^{2}+8m+16
Use the distributive property to multiply m+2 by m+6 and combine like terms.
m^{2}+8m+12-m-m^{2}=8m+16
Subtract m^{2} from both sides.
8m+12-m=8m+16
Combine m^{2} and -m^{2} to get 0.
8m+12-m-8m=16
Subtract 8m from both sides.
12-m=16
Combine 8m and -8m to get 0.
-m=16-12
Subtract 12 from both sides.
-m=4
Subtract 12 from 16 to get 4.
m=-4
Multiply both sides by -1.