Simplify the following expressions.

The simplified expression for the following expression are:
7a + 3a - 2a + 5a
= 15a - 2a
= 13a
0.7 - 0.3g - 0.02g + 5
= 5.7 - 0.32g
5g² + 3g - 4g + 5g²
= 10g² - g
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