3x+15+4x=2x+40

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Solution for 3x+15+4x=2x+40 equation: 



3x+15+4x=2x+40

We move all terms to the left:

3x+15+4x-(2x+40)=0

We add all the numbers together, and all the variables

7x-(2x+40)+15=0

We get rid of parentheses

7x-2x-40+15=0

We add all the numbers together, and all the variables

5x-25=0

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

5x=25

x=25/5

x=5

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