2x=15+21

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Solution for 2x=15+21 equation: 



2x=15+21

We move all terms to the left:

2x-(15+21)=0

We add all the numbers together, and all the variables

2x-36=0

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

2x=36

x=36/2

x=18

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