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7=-10+z-5
We move all terms to the left:
7-(-10+z-5)=0
We add all the numbers together, and all the variables
-(z-15)+7=0
We get rid of parentheses
-z+15+7=0
We add all the numbers together, and all the variables
-1z+22=0
We move all terms containing z to the left, all other terms to the right
-z=-22
z=-22/-1
z=+22
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