2*x+2*2x=30

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Solution for 2*x+2*2x=30 equation: 



2x+2*2x=30

We move all terms to the left:

2x+2*2x-(30)=0

Wy multiply elements

2x+4x-30=0

We add all the numbers together, and all the variables

6x-30=0

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

6x=30

x=30/6

x=5

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