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6=\left(x-10\right)\times 2-\left(x+10\right)\times 4
Variable x cannot be equal to any of the values -10,10 since division by zero is not defined. Multiply both sides of the equation by \left(x-10\right)\left(x+10\right), the least common multiple of x^{2}-100,x+10,x-10.
6=2x-20-\left(x+10\right)\times 4
Use the distributive property to multiply x-10 by 2.
6=2x-20-\left(4x+40\right)
Use the distributive property to multiply x+10 by 4.
6=2x-20-4x-40
To find the opposite of 4x+40, find the opposite of each term.
6=-2x-20-40
Combine 2x and -4x to get -2x.
6=-2x-60
Subtract 40 from -20 to get -60.
-2x-60=6
Swap sides so that all variable terms are on the left hand side.
-2x=6+60
Add 60 to both sides.
-2x=66
Add 6 and 60 to get 66.
x=\frac{66}{-2}
Divide both sides by -2.
x=-33
Divide 66 by -2 to get -33.