Solve for a a+1-2=4

$a + 1 - 2 = 4$

Subtract $2$ from $1$ .

$a - 1 = 4$

Move all terms not containing $a$ to the right side of the equation.

Add $1$ to both sides of the equation.

$a = 4 + 1$

Add $4$ and $1$ .

$a = 5$

$a = 5$

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