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25z-(-10z+25)=20z+15-10z
We move all terms to the left:
25z-(-10z+25)-(20z+15-10z)=0
We add all the numbers together, and all the variables
25z-(-10z+25)-(10z+15)=0
We get rid of parentheses
25z+10z-10z-25-15=0
We add all the numbers together, and all the variables
25z-40=0
We move all terms containing z to the left, all other terms to the right
25z=40
z=40/25
z=1+3/5
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