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(x+6)(x-6)=10x+x*x-2x*4+4*4
We move all terms to the left:
(x+6)(x-6)-(10x+x*x-2x*4+4*4)=0
We add all the numbers together, and all the variables
(x+6)(x-6)-(10x+x*x-2x*4+16)=0
We use the square of the difference formula
x^2-(10x+x*x-2x*4+16)-36=0
We get rid of parentheses
x^2-10x-x*x+2x*4-16-36=0
We add all the numbers together, and all the variables
x^2-10x-x*x+2x*4-52=0
Wy multiply elements
x^2-1x^2-10x+8x-52=0
We add all the numbers together, and all the variables
-2x-52=0
We move all terms containing x to the left, all other terms to the right
-2x=52
x=52/-2
x=-26
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