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2.4(z+7)=13
We move all terms to the left:
2.4(z+7)-(13)=0
We multiply parentheses
2.4z+16.8-13=0
We add all the numbers together, and all the variables
2.4z+3.8=0
We move all terms containing z to the left, all other terms to the right
2.4z=-3.8
z=-3.8/2.4
z=-1+1/1.7142857142857
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