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Combine like terms and simplify: 12 + 3(2x + 5) - 3x
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so we need to expand 3(2x+5). to do this, we multiply 3 by 2x, which gives us 6x, and then 3 times 5 which is 15, so it becomes 6x+15. the like terms are 12, 15. the other like terms are 6x and -3x. If we add those, we get 27, and 3x. Therefore the answer is 3x+27.
\[12 + 3(2x+5) - 3x\]
\[12 + 6x +15 - 3x\]
\[6x-3x + 12+15\]
\[3x+27\]
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