3x+21=18-5

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Solution for 3x+21=18-5 equation: 



3x+21=18-5

We move all terms to the left:

3x+21-(18-5)=0

We add all the numbers together, and all the variables

3x+21-13=0

We add all the numbers together, and all the variables

3x+8=0

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

3x=-8

x=-8/3

x=-2+2/3

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