12x+15=7x-3.5

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Solution for 12x+15=7x-3.5 equation: 



12x+15=7x-3.5

We move all terms to the left:

12x+15-(7x-3.5)=0

We get rid of parentheses

12x-7x+3.5+15=0

We add all the numbers together, and all the variables

5x+18.5=0

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

5x=-18.5

x=-18.5/5

x=-3+2.3333333333333/3.3333333333333

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