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21+8z=-4(3z+9)
We move all terms to the left:
21+8z-(-4(3z+9))=0
We calculate terms in parentheses: -(-4(3z+9)), so:We get rid of parentheses
-4(3z+9)
We multiply parentheses
-12z-36
Back to the equation:
-(-12z-36)
8z+12z+36+21=0
We add all the numbers together, and all the variables
20z+57=0
We move all terms containing z to the left, all other terms to the right
20z=-57
z=-57/20
z=-2+17/20
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