12x-42+15x-21=180

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Solution for 12x-42+15x-21=180 equation: 



12x-42+15x-21=180

We move all terms to the left:

12x-42+15x-21-(180)=0

We add all the numbers together, and all the variables

27x-243=0

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

27x=243

x=243/27

x=9

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