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![\sf (2x+10)+(2x-30)\\\\Resolving \ Parenthesis\\\\= 2x+10+2x-30\\\\Combining \ like \ terms\\\\= 2x + 2x + 10-30\\\\= 4x -20\\\\\rule[225]{225}{2}](/tpl/images/2330/0098/2232d.png)
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