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4*10=z-12
We move all terms to the left:
4*10-(z-12)=0
We add all the numbers together, and all the variables
-(z-12)+40=0
We get rid of parentheses
-z+12+40=0
We add all the numbers together, and all the variables
-1z+52=0
We move all terms containing z to the left, all other terms to the right
-z=-52
z=-52/-1
z=+52
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