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30=-2(24-z)+3(z-4)
We move all terms to the left:
30-(-2(24-z)+3(z-4))=0
We add all the numbers together, and all the variables
-(-2(-1z+24)+3(z-4))+30=0
We calculate terms in parentheses: -(-2(-1z+24)+3(z-4)), so:We get rid of parentheses
-2(-1z+24)+3(z-4)
We multiply parentheses
2z+3z-48-12
We add all the numbers together, and all the variables
5z-60
Back to the equation:
-(5z-60)
-5z+60+30=0
We add all the numbers together, and all the variables
-5z+90=0
We move all terms containing z to the left, all other terms to the right
-5z=-90
z=-90/-5
z=+18
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