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Evaluate 3x +9 when x=4

User AMadinger
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3x+9 is or equals to 21



User Sgauri
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So you can use substitution for this problem which is plugging in the 4 for x:
3(4)+9
then you know that you can simplify it even more to
12+9
that can be simplified even more to
21
which is in simpliest form
User Ever
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