$2x+7$

Distribute the subtraction sign to the terms inside the parentheses, and then combine like terms. See part (c) for a worked example.

$3x+4.4-2(6.6+x)$

Remember to distribute the negative inside the parentheses.

$3x+4.4-13.2-2x$

Combine like terms by adding or subtracting the constants.

$x-8.8$