21+3x=-15

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Solution for 21+3x=-15 equation: 



21+3x=-15

We move all terms to the left:

21+3x-(-15)=0

We add all the numbers together, and all the variables

3x+36=0

We move all terms containing x to the left, all other terms to the right

3x=-36

x=-36/3

x=-12

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