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10(2-z)=4(2-9)
We move all terms to the left:
10(2-z)-(4(2-9))=0
We add all the numbers together, and all the variables
10(-1z+2)-(4(-7))=0
We add all the numbers together, and all the variables
10(-1z+2)+28=0
We multiply parentheses
-10z+20+28=0
We add all the numbers together, and all the variables
-10z+48=0
We move all terms containing z to the left, all other terms to the right
-10z=-48
z=-48/-10
z=4+4/5
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