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(z+1)(z+5)=(z+2)(z+3)
We move all terms to the left:
(z+1)(z+5)-((z+2)(z+3))=0
We multiply parentheses ..
(+z^2+5z+z+5)-((z+2)(z+3))=0
We calculate terms in parentheses: -((z+2)(z+3)), so:We get rid of parentheses
(z+2)(z+3)
We multiply parentheses ..
(+z^2+3z+2z+6)
We get rid of parentheses
z^2+3z+2z+6
We add all the numbers together, and all the variables
z^2+5z+6
Back to the equation:
-(z^2+5z+6)
z^2-z^2+5z+z-5z+5-6=0
We add all the numbers together, and all the variables
z-1=0
We move all terms containing z to the left, all other terms to the right
z=1
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