2x+2x=3+15

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Solution for 2x+2x=3+15 equation: 



2x+2x=3+15

We move all terms to the left:

2x+2x-(3+15)=0

We add all the numbers together, and all the variables

2x+2x-18=0

We add all the numbers together, and all the variables

4x-18=0

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

4x=18

x=18/4

x=4+1/2

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