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6+3(10+z)=30
We move all terms to the left:
6+3(10+z)-(30)=0
We add all the numbers together, and all the variables
3(z+10)+6-30=0
We add all the numbers together, and all the variables
3(z+10)-24=0
We multiply parentheses
3z+30-24=0
We add all the numbers together, and all the variables
3z+6=0
We move all terms containing z to the left, all other terms to the right
3z=-6
z=-6/3
z=-2
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