m ( x - 4 ) + m ( 4 - x
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mx-4m+m\left(4-x\right)
Use the distributive property to multiply m by x-4.
mx-4m+4m-mx
Use the distributive property to multiply m by 4-x.
mx-mx
Combine -4m and 4m to get 0.
0
Combine mx and -mx to get 0.
m\left(x-4+4-x\right)
Factor out common term m by using distributive property.
0
Consider x-4+4-x. Simplify.
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