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Expression: $1+\left( x+8 \right)=12$

When there is a $+$ in front of an expression in parentheses, the expression remains the same

$1+x+8=12$

Add the numbers

$9+x=12$

Move the constant to the right-hand side and change its sign

$x=12-9$

Subtract the numbers

$x=3$

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