Solve for w
w = \frac{57}{20} = 2\frac{17}{20} = 2.85
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20w-12=5\left(2\times 4+1\right)
Multiply both sides of the equation by 20, the least common multiple of 5,4.
20w-12=5\left(8+1\right)
Multiply 2 and 4 to get 8.
20w-12=5\times 9
Add 8 and 1 to get 9.
20w-12=45
Multiply 5 and 9 to get 45.
20w=45+12
Add 12 to both sides.
20w=57
Add 45 and 12 to get 57.
w=\frac{57}{20}
Divide both sides by 20.
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