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3.4=-2(z-14.3)
We move all terms to the left:
3.4-(-2(z-14.3))=0
We calculate terms in parentheses: -(-2(z-14.3)), so:We get rid of parentheses
-2(z-14.3)
We multiply parentheses
-2z+28.6
Back to the equation:
-(-2z+28.6)
2z-28.6+3.4=0
We add all the numbers together, and all the variables
2z-25.2=0
We move all terms containing z to the left, all other terms to the right
2z=25.2
z=25.2/2
z=12+1/1.6666666666667
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