3x-15+x+15=155

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Solution for 3x-15+x+15=155 equation: 



3x-15+x+15=155

We move all terms to the left:

3x-15+x+15-(155)=0

We add all the numbers together, and all the variables

4x-155=0

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

4x=155

x=155/4

x=38+3/4

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