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19.8-6z=7+4(9-10z)
We move all terms to the left:
19.8-6z-(7+4(9-10z))=0
We add all the numbers together, and all the variables
-6z-(7+4(-10z+9))+19.8=0
We calculate terms in parentheses: -(7+4(-10z+9)), so:We get rid of parentheses
7+4(-10z+9)
determiningTheFunctionDomain 4(-10z+9)+7
We multiply parentheses
-40z+36+7
We add all the numbers together, and all the variables
-40z+43
Back to the equation:
-(-40z+43)
-6z+40z-43+19.8=0
We add all the numbers together, and all the variables
34z-23.2=0
We move all terms containing z to the left, all other terms to the right
34z=23.2
z=23.2/34
z=19.333333333333/28.333333333333
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