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\left(x-6\right)\left(6-x\right)=-\left(4+x\right)x
Variable x cannot be equal to any of the values -4,6 since division by zero is not defined. Multiply both sides of the equation by \left(x-6\right)\left(x+4\right), the least common multiple of x+4,6-x.
12x-x^{2}-36=-\left(4+x\right)x
Use the distributive property to multiply x-6 by 6-x and combine like terms.
12x-x^{2}-36=\left(-4-x\right)x
Use the distributive property to multiply -1 by 4+x.
12x-x^{2}-36=-4x-x^{2}
Use the distributive property to multiply -4-x by x.
12x-x^{2}-36+4x=-x^{2}
Add 4x to both sides.
16x-x^{2}-36=-x^{2}
Combine 12x and 4x to get 16x.
16x-x^{2}-36+x^{2}=0
Add x^{2} to both sides.
16x-36=0
Combine -x^{2} and x^{2} to get 0.
16x=36
Add 36 to both sides. Anything plus zero gives itself.
x=\frac{36}{16}
Divide both sides by 16.
x=\frac{9}{4}
Reduce the fraction \frac{36}{16} to lowest terms by extracting and canceling out 4.