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1=z-90/7
We move all terms to the left:
1-(z-90/7)=0
We add all the numbers together, and all the variables
-(+z-90/7)+1=0
We get rid of parentheses
-z+1+90/7=0
We multiply all the terms by the denominator
-z*7+90+1*7=0
We add all the numbers together, and all the variables
-z*7+97=0
Wy multiply elements
-7z+97=0
We move all terms containing z to the left, all other terms to the right
-7z=-97
z=-97/-7
z=13+6/7
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