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6z+7+4z=-3z+12
We move all terms to the left:
6z+7+4z-(-3z+12)=0
We add all the numbers together, and all the variables
10z-(-3z+12)+7=0
We get rid of parentheses
10z+3z-12+7=0
We add all the numbers together, and all the variables
13z-5=0
We move all terms containing z to the left, all other terms to the right
13z=5
z=5/13
z=5/13
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