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0.4(4z+7)+10.8=0.6(4z-4)
We move all terms to the left:
0.4(4z+7)+10.8-(0.6(4z-4))=0
We multiply parentheses
1.6z-(0.6(4z-4))+2.8+10.8=0
We calculate terms in parentheses: -(0.6(4z-4)), so:We add all the numbers together, and all the variables
0.6(4z-4)
We multiply parentheses
2.4z-2.4
Back to the equation:
-(2.4z-2.4)
1.6z-(2.4z-2.4)+13.6=0
We get rid of parentheses
1.6z-2.4z+2.4+13.6=0
We add all the numbers together, and all the variables
-0.8z+16=0
We move all terms containing z to the left, all other terms to the right
-0.8z=-16
z=-16/-0.8
z=+20
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