3x+45+4x-75=180

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Solution for 3x+45+4x-75=180 equation: 



3x+45+4x-75=180

We move all terms to the left:

3x+45+4x-75-(180)=0

We add all the numbers together, and all the variables

7x-210=0

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

7x=210

x=210/7

x=30

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