2x+3x+5-7x=20

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Solution for 2x+3x+5-7x=20 equation: 



2x+3x+5-7x=20

We move all terms to the left:

2x+3x+5-7x-(20)=0

We add all the numbers together, and all the variables

-2x-15=0

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

-2x=15

x=15/-2

x=-7+1/2

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