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-869=-5z+-239
We move all terms to the left:
-869-(-5z+-239)=0
We add all the numbers together, and all the variables
-(-5z-239)-869=0
We get rid of parentheses
5z+239-869=0
We add all the numbers together, and all the variables
5z-630=0
We move all terms containing z to the left, all other terms to the right
5z=630
z=630/5
z=126
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