Solve for z
z=57.45
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2z=102.45+12.45
Add 12.45 to both sides.
2z=114.9
Add 102.45 and 12.45 to get 114.9.
z=\frac{114.9}{2}
Divide both sides by 2.
z=\frac{1149}{20}
Expand \frac{114.9}{2} by multiplying both numerator and the denominator by 10.
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