3x+15+x+7=135

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Solution for 3x+15+x+7=135 equation: 



3x+15+x+7=135

We move all terms to the left:

3x+15+x+7-(135)=0

We add all the numbers together, and all the variables

4x-113=0

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

4x=113

x=113/4

x=28+1/4

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