Solve for x
x = \frac{79}{2} = 39\frac{1}{2} = 39.5
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42=2x-\left(18\times 2+1\right)
Multiply both sides of the equation by 2.
42=2x-\left(36+1\right)
Multiply 18 and 2 to get 36.
42=2x-37
Add 36 and 1 to get 37.
2x-37=42
Swap sides so that all variable terms are on the left hand side.
2x=42+37
Add 37 to both sides.
2x=79
Add 42 and 37 to get 79.
x=\frac{79}{2}
Divide both sides by 2.
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