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4\left(\frac{1}{2}x-5\right)=x+1-18
Multiply both sides of the equation by 6, the least common multiple of 3,2,6.
4\times \frac{1}{2}x-20=x+1-18
Use the distributive property to multiply 4 by \frac{1}{2}x-5.
\frac{4}{2}x-20=x+1-18
Multiply 4 and \frac{1}{2} to get \frac{4}{2}.
2x-20=x+1-18
Divide 4 by 2 to get 2.
2x-20=x-17
Subtract 18 from 1 to get -17.
2x-20-x=-17
Subtract x from both sides.
x-20=-17
Combine 2x and -x to get x.
x=-17+20
Add 20 to both sides.
x=3
Add -17 and 20 to get 3.