2x+3x=12+8

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Solution for 2x+3x=12+8 equation: 



2x+3x=12+8

We move all terms to the left:

2x+3x-(12+8)=0

We add all the numbers together, and all the variables

2x+3x-20=0

We add all the numbers together, and all the variables

5x-20=0

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

5x=20

x=20/5

x=4

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