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75=4z-3(4z-1)
We move all terms to the left:
75-(4z-3(4z-1))=0
We calculate terms in parentheses: -(4z-3(4z-1)), so:We get rid of parentheses
4z-3(4z-1)
We multiply parentheses
4z-12z+3
We add all the numbers together, and all the variables
-8z+3
Back to the equation:
-(-8z+3)
8z-3+75=0
We add all the numbers together, and all the variables
8z+72=0
We move all terms containing z to the left, all other terms to the right
8z=-72
z=-72/8
z=-9
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